(1)AB=BA吗? (2)(A B) 2 =A 2 2AB B 2 吗? (3)(A B)(A-B)=A 2 -B 2 吗?
(1)AB=BA吗? (2)(A B) 2 =A 2 2AB B 2 吗? (3)(A B)(A-B)=A 2 -B 2 吗?
发布时间:2025-09-08 00:12:28
(1)AB=BA吗? (2)(A B) 2 =A 2 2AB B 2 吗? (3)(A B)(A-B)=A 2 -B 2 吗?