Question

(x减y)平方减4(x减y加3)因式分解

Answer 1

(x-y)^2-4(x-y+3)

=(x-y)^2-4(x-y)+2^2-16

=(x-y-2)^2-16

=(x-y-2-4)(x-y-2+4)

=(x-y-6)(x-y+2)

回答的有点慢,手机不好使.

希望可以采纳