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RIJEÅ ENI ZADACI IZ MATEMATIKE

RIJEÅ ENI ZADACI IZ MATEMATIKE

RIJEÅ ENI ZADACI IZ MATEMATIKE

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6. Odredite sve dijagonalne matrice A ∈ M 2 , koje s matricom B tvore komutativanpar s obzirom na množenje ako je,[ ] 0 −1B =1 0Rješenje:A =[ ] x 00 yA · B = B · A[ ] [ ] [ ] [ ]x 0 0 −1 x · 0 + 0 · 1 x · (−1) + 0 · 0 0 −xA · B = · ==0 y 1 0 0 · 0 + y · 1 0 · (−1) + y · 0 y 0[ ] [ ] [ ] [ ]0 −1 x 0 0 · x + (−1) · 0 0 · 0 + (−1) · y 0 −yB · A = · ==1 0 0 y 1 · x + 0 · 0 1 · 0 + 0 · y x 0A · B = B · A[ ] [ ]0 −x 0 −y=y 0 x 00 = 0−x = −yy = x0 = 0[ ] x 0A =0 y[ ] x 0A = , x ∈ R0 x7

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