(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
问题描述:
(a-b)(x-y)-(b-a)(x+y)等于(用因式分解)
答
(a-b)(x-y)-(b-a)(x+y)
=(a-b)(x-y)+(a-b)(x+y)
=(a-b)[(x-y)+(x+y)]
=(a-b)(2x)
=2x(a-b)