(x-y)²-8(x-y-2)

来源：学生学帮网 编辑：学帮网 时间：2024/06/11 08:16:04

(x-y)²-8(x-y-2)

(x-y)²-8(x-y-2)
=(x-y)²-8(x-y)+8
=(x-y)²-8(x-y)+4²
=(x-y-4)²