複選題

21. Given vectors x, y, z in IR" and matrices A, B, C in 620458f382322.jpg. Which of the following statements are true?
(A) 62045921e1b6b.jpg


(B) 62045929d3498.jpg


(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.

答案：登入後查看
統計： A(1), B(1), C(0), D(2), E(0) #2861281