问题详情
设a,b,c均为向量,下列等式正确的是:
(A) (a + b)(a-b) = a 2 - b 2 (B) a.(a.b) = a 2 b
(C) (a.b)2 = a 2 b 2 (D) (a + b) × (a - b) = a × a - b × b