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19. Lct A, B, C be matices. Which of the following is true?
(A) IF AB and BA are computable, then AB = BA;
(B) If AB = AC, then B = C;
(C) IfA + B = A + C, then B = C;
(D) If A is square, then A is invertible. 


19. Lct A, B, C be matices. Which of the..-阿摩線上測驗