<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
	<id>https://wiki.universitas.ro/index.php?action=history&amp;feed=atom&amp;title=E%3A16910</id>
	<title>E:16910 - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://wiki.universitas.ro/index.php?action=history&amp;feed=atom&amp;title=E%3A16910"/>
	<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:16910&amp;action=history"/>
	<updated>2026-05-03T07:10:55Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.42.1</generator>
	<entry>
		<id>https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10725&amp;oldid=prev</id>
		<title>Andrei.Horvat at 17:28, 20 August 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10725&amp;oldid=prev"/>
		<updated>2025-08-20T17:28:51Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 17:28, 20 August 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l12&quot;&gt;Line 12:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 12:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math display=&amp;quot;block&amp;quot;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math display=&amp;quot;block&amp;quot;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;Se obțin soluțiile &amp;lt;math display=&quot;block&quot;&amp;gt;\left(x,y\right)\in \left\{ &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&amp;lt;/nowiki&amp;gt;&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;Se obțin soluțiile &amp;lt;math display=&quot;block&quot;&amp;gt;\left(x,y\right)\in \left\{ \left(\pm 6,-5\right), \, \left(\pm 6, 5\right)\right\}.&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)\right\}.&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Andrei.Horvat</name></author>
	</entry>
	<entry>
		<id>https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10724&amp;oldid=prev</id>
		<title>Andrei.Horvat at 17:28, 20 August 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10724&amp;oldid=prev"/>
		<updated>2025-08-20T17:28:10Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 17:28, 20 August 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l12&quot;&gt;Line 12:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 12:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math display=&amp;quot;block&amp;quot;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math display=&amp;quot;block&amp;quot;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;Se obțin soluțiile &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&amp;lt;nowiki&amp;gt;&lt;/del&gt;&amp;lt;math&amp;gt;\left(x,y\right)\in \left\{ &amp;lt;/nowiki&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;Se obțin soluțiile &amp;lt;math &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;display=&quot;block&quot;&lt;/ins&gt;&amp;gt;\left(x,y\right)\in \left\{ &amp;lt;/nowiki&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)\right\}&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;.&lt;/ins&gt;&amp;lt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;/&lt;/ins&gt;math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\right\}&amp;lt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;.&lt;/del&gt;math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Andrei.Horvat</name></author>
	</entry>
	<entry>
		<id>https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10723&amp;oldid=prev</id>
		<title>Andrei.Horvat at 17:27, 20 August 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10723&amp;oldid=prev"/>
		<updated>2025-08-20T17:27:18Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 17:27, 20 August 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l5&quot;&gt;Line 5:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 5:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;Soluție&amp;#039;&amp;#039;&amp;#039;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;Soluție&amp;#039;&amp;#039;&amp;#039;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cum &amp;lt;math&amp;gt;x^4 + 4y^4 = \left(x^2+2y^2\right)^2 - 4x^2y^2 = \left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right)&amp;lt;/math&amp;gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;, &lt;/del&gt;ecuația dată revine la &amp;lt;math&amp;gt;\left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right) = 3796&amp;lt;/math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cum &amp;lt;math &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;display=&quot;block&quot;&lt;/ins&gt;&amp;gt;x^4 + 4y^4 = \left(x^2+2y^2\right)^2 - 4x^2y^2 = \left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right)&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;,&lt;/ins&gt;&amp;lt;/math&amp;gt;ecuația dată revine la &amp;lt;math &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;display=&quot;block&quot;&lt;/ins&gt;&amp;gt;\left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right) = 3796&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;.&amp;lt;/math&amp;gt;Din &amp;lt;math&amp;gt;2y^2-2xy\, \vdots \, 2&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;2y^2+2xy\, \vdots \, 2&amp;lt;/math&amp;gt; se deduce că expresiile pozitive &amp;lt;math&amp;gt;x^2 + 2y^2-2xy&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;x^2 +2y^2 +2xy&lt;/ins&gt;&amp;lt;/math&amp;gt; &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;au aceeași paritate. &lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Din &amp;lt;math&amp;gt;2y^2-2xy\, \vdots \, 2&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;2y^2+2xy\, \vdots \, 2&amp;lt;/math&amp;gt; se deduce că expresiile pozitive &amp;lt;math&amp;gt;x^2 + 2y^2-2xy&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;x^2 +2y^2 +2xy&amp;lt;/math&amp;gt; au aceeași paritate. &lt;/del&gt;Cum &amp;lt;math&amp;gt;3796 = 2^2 \cdot 13\cdot 73&amp;lt;/math&amp;gt;, sunt posibile situațiile  &lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cum &amp;lt;math&amp;gt;3796 = 2^2 \cdot 13\cdot 73&amp;lt;/math&amp;gt;, sunt posibile situațiile  &lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;math&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;math &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;display=&quot;block&quot;&lt;/ins&gt;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;	x^2+2y^2-2xy = 26 \\ x^2 + 2y^2 +2xy = 146&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;	x^2+2y^2-2xy = 26 \\ x^2 + 2y^2 +2xy = 146&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;display=&quot;block&quot;&lt;/ins&gt;&amp;gt;\begin{cases}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;. &lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\end{cases}&amp;lt;/math&amp;gt;Se obțin soluțiile &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&amp;lt;nowiki&amp;gt;&lt;/ins&gt;&amp;lt;math&amp;gt;\left(x,y\right)\in \left\{ &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&amp;lt;/nowiki&amp;gt;&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt; &lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Se obțin soluțiile &amp;lt;math&amp;gt;\left(x,y\right)\in \left\{  &lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-added&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\right\}&amp;lt;.math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;\right\}&amp;lt;.math&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Andrei.Horvat</name></author>
	</entry>
	<entry>
		<id>https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10722&amp;oldid=prev</id>
		<title>Andrei.Horvat: Created page with &quot;&#039;&#039;&#039;E:16910 (Teodora Zetea &amp; Bogdan Zetea)&#039;&#039;&#039;  &#039;&#039;Aflați soluțiile întregi ale ecuației &lt;math&gt;x^4 + 4y^4 = 3796.&lt;/math&gt;&#039;&#039;  &#039;&#039;&#039;Soluție&#039;&#039;&#039;  Cum &lt;math&gt;x^4 + 4y^4 = \left(x^2+2y^2\right)^2 - 4x^2y^2 = \left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right)&lt;/math&gt;, ecuația dată revine la &lt;math&gt;\left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right) = 3796&lt;/math&gt;  Din &lt;math&gt;2y^2-2xy\, \vdots \, 2&lt;/math&gt; și &lt;math&gt;2y^2+2xy\, \vdots \, 2&lt;/math&gt; se deduce că expresiile pozi...&quot;</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:16910&amp;diff=10722&amp;oldid=prev"/>
		<updated>2025-08-20T17:25:53Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;&amp;#039;&amp;#039;&amp;#039;&lt;a href=&quot;/wiki/E:16910&quot; title=&quot;E:16910&quot;&gt;E:16910&lt;/a&gt; (Teodora Zetea &amp;amp; Bogdan Zetea)&amp;#039;&amp;#039;&amp;#039;  &amp;#039;&amp;#039;Aflați soluțiile întregi ale ecuației &amp;lt;math&amp;gt;x^4 + 4y^4 = 3796.&amp;lt;/math&amp;gt;&amp;#039;&amp;#039;  &amp;#039;&amp;#039;&amp;#039;Soluție&amp;#039;&amp;#039;&amp;#039;  Cum &amp;lt;math&amp;gt;x^4 + 4y^4 = \left(x^2+2y^2\right)^2 - 4x^2y^2 = \left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right)&amp;lt;/math&amp;gt;, ecuația dată revine la &amp;lt;math&amp;gt;\left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right) = 3796&amp;lt;/math&amp;gt;  Din &amp;lt;math&amp;gt;2y^2-2xy\, \vdots \, 2&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;2y^2+2xy\, \vdots \, 2&amp;lt;/math&amp;gt; se deduce că expresiile pozi...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;&amp;#039;&amp;#039;&amp;#039;[[E:16910]] (Teodora Zetea &amp;amp; Bogdan Zetea)&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;Aflați soluțiile întregi ale ecuației &amp;lt;math&amp;gt;x^4 + 4y^4 = 3796.&amp;lt;/math&amp;gt;&amp;#039;&amp;#039;&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;&amp;#039;Soluție&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
&lt;br /&gt;
Cum &amp;lt;math&amp;gt;x^4 + 4y^4 = \left(x^2+2y^2\right)^2 - 4x^2y^2 = \left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right)&amp;lt;/math&amp;gt;, ecuația dată revine la &amp;lt;math&amp;gt;\left(x^2+2y^2-2xy\right)\left(x^2 + 2y^2 +2xy\right) = 3796&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Din &amp;lt;math&amp;gt;2y^2-2xy\, \vdots \, 2&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;2y^2+2xy\, \vdots \, 2&amp;lt;/math&amp;gt; se deduce că expresiile pozitive &amp;lt;math&amp;gt;x^2 + 2y^2-2xy&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;x^2 +2y^2 +2xy&amp;lt;/math&amp;gt; au aceeași paritate. Cum &amp;lt;math&amp;gt;3796 = 2^2 \cdot 13\cdot 73&amp;lt;/math&amp;gt;, sunt posibile situațiile &lt;br /&gt;
&amp;lt;math&amp;gt;\begin{cases}&lt;br /&gt;
	x^2+2y^2-2xy = 26 \\ x^2 + 2y^2 +2xy = 146&lt;br /&gt;
\end{cases}&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;\begin{cases}&lt;br /&gt;
x^2+2y^2-2xy = 146 \\ x^2 + 2y^2 +2xy = 26&lt;br /&gt;
\end{cases}&amp;lt;/math&amp;gt;. &lt;br /&gt;
&lt;br /&gt;
Se obțin soluțiile &amp;lt;math&amp;gt;\left(x,y\right)\in \left\{ &lt;br /&gt;
\left(\pm 6,-5\right), \, \left(\pm 6, 5\right)&lt;br /&gt;
\right\}&amp;lt;.math&amp;gt;&lt;/div&gt;</summary>
		<author><name>Andrei.Horvat</name></author>
	</entry>
</feed>