Usando as matrizes e escalares do Exercício, verifique que
a(BC) = (aB)C = B(aC)
Exercício
Sejam
Mostre que
(a) A + (B+C)=(A+B)+C
(b)(AB)C = A(BC)
(c)(a+b)C = aC+bC
(d) a(B–C)= aB–aC
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