Gazeta matematică 2022

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Gazeta Matematică 3/2022

S:L22.108. (Nicolae Mușuroia)

Fie Failed to parse (syntax error): {\displaystyle A, B \in \mathcal{M}_3 (\mathbb{R})} cu ,  neinversabilă și Failed to parse (syntax error): {\displaystyle det⁡(A)=α det⁡(B)≠0} , unde Failed to parse (syntax error): {\displaystyle α≠1<math/>. Arătați că <math display="block">\frac{\det⁡(A+B)}{\det⁡(A-B)} = \frac{\det⁡(A) + \det⁡(B)}{\det⁡(A)-\det⁡(B)}.}