問題詳情

21. Given vectors x, y,z in

and matrices A, B, C in

. Which of the following statements are
true?

(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