User contributions for Andreica Dragos

16 January 2024

• 17:4817:48, 16 January 2024 diff hist +4‎ 14682 ‎No edit summary
• 17:4817:48, 16 January 2024 diff hist −1‎ 14682 ‎No edit summary
• 14:5914:59, 16 January 2024 diff hist 0‎ 14682 ‎No edit summary
• 14:5814:58, 16 January 2024 diff hist +2‎ 14682 ‎No edit summary
• 14:5714:57, 16 January 2024 diff hist +2‎ 14682 ‎No edit summary
• 14:5414:54, 16 January 2024 diff hist +1,186‎ N 14682 ‎ Pagină nouă: '''14682 (Cristina Vijdeluc și Mihai Vijdeluc)''' '''Enunț:''' Se consideră triunghiul ABC în care <math>m(\angle A) = 2 \cdot m(\angle B) + 30^\circ</math>. Punctul M este situat pe segmentul (BC) astfel încât AM = AC. Dacă <math>m(\angle MAC) = 2 \cdot m(\angle MAB)</math>, arătați că BM = MC. '''Soluție:''' Notăm <math>a = m(\angle ABC)</math> și <math>x = m(\angle BAM)</math>. Avem <math>m(\angle BAC) = 2a + 30^\circ</math> și <math>m(\angle CAM) = 2x...
• 14:5314:53, 16 January 2024 diff hist +2‎ Gazeta Matematică ‎No edit summary
• 14:5014:50, 16 January 2024 diff hist +684‎ 14683 ‎No edit summary current
• 14:3314:33, 16 January 2024 diff hist −267‎ 14683 ‎No edit summary
• 14:2814:28, 16 January 2024 diff hist +151‎ 14683 ‎No edit summary
• 12:0012:00, 16 January 2024 diff hist −1‎ Gazeta Matematică ‎No edit summary
• 11:5811:58, 16 January 2024 diff hist +2‎ 14683 ‎No edit summary
• 11:5811:58, 16 January 2024 diff hist −279‎ 14683 ‎No edit summary
• 11:5511:55, 16 January 2024 diff hist −12‎ 14683 ‎No edit summary
• 11:5211:52, 16 January 2024 diff hist +139‎ 14683 ‎No edit summary
• 11:4611:46, 16 January 2024 diff hist +21‎ 14683 ‎No edit summary
• 11:4511:45, 16 January 2024 diff hist +16‎ 14683 ‎No edit summary
• 11:4411:44, 16 January 2024 diff hist −11‎ 14683 ‎No edit summary
• 11:4311:43, 16 January 2024 diff hist −6‎ 14683 ‎No edit summary
• 11:4311:43, 16 January 2024 diff hist +26‎ 14683 ‎No edit summary
• 11:4011:40, 16 January 2024 diff hist +4‎ 14683 ‎No edit summary
• 11:4011:40, 16 January 2024 diff hist −1‎ 14683 ‎No edit summary
• 11:4011:40, 16 January 2024 diff hist +719‎ N 14683 ‎ Pagină nouă: '''14683 (Răzvan Ceuca)''' ''Fie matricele <math>A, B \in \mathcal{M}_3(\mathbb{C}),</math> care verifică simultan condițiile: <ol style="list-style-type:lower-roman"> <li><i><math>AB = BA;</math></i></li> <li><i>matricea <math>A</math> este nilpotentă și matricea <math>B</math> este inversabilă.<br>Arătați că ecuația <math>AX + XA = B</math> nu are soluții în <math>\mathcal{M}_3(\mathbb{C})</math>.</i></li> </ol> '''Soluție:''' Relația din enunț se mai...
• 11:3211:32, 16 January 2024 diff hist +39‎ Gazeta Matematică ‎No edit summary