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	<id>https://wiki.universitas.ro/index.php?action=history&amp;feed=atom&amp;title=E%3A15414</id>
	<title>E:15414 - 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%3A15414"/>
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	<updated>2026-05-01T09:56:23Z</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:15414&amp;diff=10631&amp;oldid=prev</id>
		<title>Andrei.Horvat at 14:26, 23 January 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:15414&amp;diff=10631&amp;oldid=prev"/>
		<updated>2025-01-23T14:26:14Z</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 14:26, 23 January 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-l28&quot;&gt;Line 28:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 28:&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;&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;Dacă &amp;lt;math&amp;gt;b \geq 7&amp;lt;/math&amp;gt;, atunci &amp;lt;math&amp;gt;b^2 &amp;gt; 27&amp;lt;/math&amp;gt;, ceea ce nu convine.&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;Dacă &amp;lt;math&amp;gt;b \geq 7&amp;lt;/math&amp;gt;, atunci &amp;lt;math&amp;gt;b^2 &amp;gt; 27&amp;lt;/math&amp;gt;, ceea ce nu convine.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;&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 colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&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;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;În concluzie, s-a obținut soluția &amp;lt;math&amp;gt; a=c=d =2&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;b=5&amp;lt;/math&amp;gt;.&lt;/ins&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:15414&amp;diff=10630&amp;oldid=prev</id>
		<title>Andrei.Horvat at 14:24, 23 January 2025</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:15414&amp;diff=10630&amp;oldid=prev"/>
		<updated>2025-01-23T14:24:15Z</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 14:24, 23 January 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-l19&quot;&gt;Line 19:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 19:&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;Cum &amp;lt;math&amp;gt;10d&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;370&amp;lt;/math&amp;gt; sunt numere pare, rezultă că &amp;lt;math&amp;gt;19c&amp;lt;/math&amp;gt; este număr par. Deci &amp;lt;math&amp;gt;c = 2&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;Cum &amp;lt;math&amp;gt;10d&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;370&amp;lt;/math&amp;gt; sunt numere pare, rezultă că &amp;lt;math&amp;gt;19c&amp;lt;/math&amp;gt; este număr par. Deci &amp;lt;math&amp;gt;c = 2&amp;lt;/math&amp;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;Înlocuind în &amp;lt;math&amp;gt;(2)&amp;lt;/math&amp;gt;, obținem valoarea pentru &amp;lt;math&amp;gt;d&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;Înlocuind în &amp;lt;math&amp;gt;(2)&amp;lt;/math&amp;gt;, &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;nu &lt;/ins&gt;obținem valoarea pentru &amp;lt;math&amp;gt;d&amp;lt;/math&amp;gt; &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;un număr natural&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;&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;Dacă &amp;lt;math&amp;gt;b = 5&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math&amp;gt; devine:&amp;lt;/p&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;Dacă &amp;lt;math&amp;gt;b = 5&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math&amp;gt; devine:&amp;lt;/p&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:15414&amp;diff=10629&amp;oldid=prev</id>
		<title>Andrei.Horvat: Created page with &quot;&#039;&#039;&#039;E:15414 (Cristina Vijdeluc și Mihai Vijdeluc)&#039;&#039;&#039;  &#039;&#039;Aflați numerele prime &lt;math&gt;a, b, c, d&lt;/math&gt; pentru care &lt;math&gt;29a^5 + 39b^2 + 38c + 20d = 2019&lt;/math&gt;.&#039;&#039;  &#039;&#039;&#039;Soluție&#039;&#039;&#039;  Din &lt;math&gt;29a^5 \leq 2019&lt;/math&gt; deducem că &lt;math&gt;a^5 \leq 69&lt;/math&gt; și deci &lt;math&gt;a = 2&lt;/math&gt;.   Relația devine &lt;math&gt;39b^2 + 38c + 20d = 1091, \quad (1).&lt;/math&gt;  Din &lt;math&gt;39b^2 \leq 1091&lt;/math&gt; deducem că &lt;math&gt;b^2 \leq 27&lt;/math&gt;.  Dacă &lt;math&gt;b = 2&lt;/math&gt;, relația &lt;math&gt;(1)&lt;/math...&quot;</title>
		<link rel="alternate" type="text/html" href="https://wiki.universitas.ro/index.php?title=E:15414&amp;diff=10629&amp;oldid=prev"/>
		<updated>2025-01-23T14:22:10Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;&amp;#039;&amp;#039;&amp;#039;&lt;a href=&quot;/wiki/E:15414&quot; title=&quot;E:15414&quot;&gt;E:15414&lt;/a&gt; (Cristina Vijdeluc și Mihai Vijdeluc)&amp;#039;&amp;#039;&amp;#039;  &amp;#039;&amp;#039;Aflați numerele prime &amp;lt;math&amp;gt;a, b, c, d&amp;lt;/math&amp;gt; pentru care &amp;lt;math&amp;gt;29a^5 + 39b^2 + 38c + 20d = 2019&amp;lt;/math&amp;gt;.&amp;#039;&amp;#039;  &amp;#039;&amp;#039;&amp;#039;Soluție&amp;#039;&amp;#039;&amp;#039;  Din &amp;lt;math&amp;gt;29a^5 \leq 2019&amp;lt;/math&amp;gt; deducem că &amp;lt;math&amp;gt;a^5 \leq 69&amp;lt;/math&amp;gt; și deci &amp;lt;math&amp;gt;a = 2&amp;lt;/math&amp;gt;.   Relația devine &amp;lt;math&amp;gt;39b^2 + 38c + 20d = 1091, \quad (1).&amp;lt;/math&amp;gt;  Din &amp;lt;math&amp;gt;39b^2 \leq 1091&amp;lt;/math&amp;gt; deducem că &amp;lt;math&amp;gt;b^2 \leq 27&amp;lt;/math&amp;gt;.  Dacă &amp;lt;math&amp;gt;b = 2&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math...&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:15414]] (Cristina Vijdeluc și Mihai Vijdeluc)&amp;#039;&amp;#039;&amp;#039;&lt;br /&gt;
&lt;br /&gt;
&amp;#039;&amp;#039;Aflați numerele prime &amp;lt;math&amp;gt;a, b, c, d&amp;lt;/math&amp;gt; pentru care &amp;lt;math&amp;gt;29a^5 + 39b^2 + 38c + 20d = 2019&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;
Din &amp;lt;math&amp;gt;29a^5 \leq 2019&amp;lt;/math&amp;gt; deducem că &amp;lt;math&amp;gt;a^5 \leq 69&amp;lt;/math&amp;gt; și deci &amp;lt;math&amp;gt;a = 2&amp;lt;/math&amp;gt;. &lt;br /&gt;
&lt;br /&gt;
Relația devine &amp;lt;math&amp;gt;39b^2 + 38c + 20d = 1091, \quad (1).&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Din &amp;lt;math&amp;gt;39b^2 \leq 1091&amp;lt;/math&amp;gt; deducem că &amp;lt;math&amp;gt;b^2 \leq 27&amp;lt;/math&amp;gt;.&lt;br /&gt;
&lt;br /&gt;
Dacă &amp;lt;math&amp;gt;b = 2&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math&amp;gt; este imposibilă deoarece membrul stâng este par, iar membrul drept este impar.&lt;br /&gt;
&lt;br /&gt;
Dacă &amp;lt;math&amp;gt;b = 3&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math&amp;gt; devine:&lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;38c + 20d = 740, \quad \text{sau} \quad 19c + 10d = 370. \quad (2).&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Cum &amp;lt;math&amp;gt;10d&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;370&amp;lt;/math&amp;gt; sunt numere pare, rezultă că &amp;lt;math&amp;gt;19c&amp;lt;/math&amp;gt; este număr par. Deci &amp;lt;math&amp;gt;c = 2&amp;lt;/math&amp;gt;.&lt;br /&gt;
&lt;br /&gt;
Înlocuind în &amp;lt;math&amp;gt;(2)&amp;lt;/math&amp;gt;, obținem valoarea pentru &amp;lt;math&amp;gt;d&amp;lt;/math&amp;gt;.&lt;br /&gt;
&lt;br /&gt;
Dacă &amp;lt;math&amp;gt;b = 5&amp;lt;/math&amp;gt;, relația &amp;lt;math&amp;gt;(1)&amp;lt;/math&amp;gt; devine:&amp;lt;/p&amp;gt;&lt;br /&gt;
&lt;br /&gt;
&amp;lt;math&amp;gt;38c + 20d = 116, \quad \text{sau} \quad 19c + 10d = 58. \quad (3).&amp;lt;/math&amp;gt;&lt;br /&gt;
&lt;br /&gt;
Cum &amp;lt;math&amp;gt;10d&amp;lt;/math&amp;gt; și &amp;lt;math&amp;gt;58&amp;lt;/math&amp;gt; sunt numere pare, rezultă că &amp;lt;math&amp;gt;19c&amp;lt;/math&amp;gt; este număr par și atunci &amp;lt;math&amp;gt;c = 2&amp;lt;/math&amp;gt;. Înlocuind în &amp;lt;math&amp;gt;(3)&amp;lt;/math&amp;gt;, obținem &amp;lt;math&amp;gt;d = 2&amp;lt;/math&amp;gt;.&lt;br /&gt;
&lt;br /&gt;
Dacă &amp;lt;math&amp;gt;b \geq 7&amp;lt;/math&amp;gt;, atunci &amp;lt;math&amp;gt;b^2 &amp;gt; 27&amp;lt;/math&amp;gt;, ceea ce nu convine.&lt;/div&gt;</summary>
		<author><name>Andrei.Horvat</name></author>
	</entry>
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