問題詳情

【題組】

21. Given vectors x, y, z in IR" and matrices A, B, C in

. Which of the following statements aretrue?
(A)


(B)


(C) (A+B)(A -B) = A2 -B2 


(D) If AC = BC and C is not the zero matrix, then A = B.
(E) If AB equals the zero matrix, then BA also equals the zero matrix.

參考答案

答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增