(a-b)(x-y)-(b-a)(x+y)等于几详细一点

2024-12-01 17:33:54
推荐回答(2个)
回答1:

原式=ax—ay—bx+by—bx—by+ax+ay
=ax+ax—ay+ay—bx—bx+by—by
=2ax—2bx
=2x(a—b)

回答2:

2a-2b+x²-y²