[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y

来源：学生作业帮助网 编辑：作业帮 时间：2024/06/02 19:42:16

[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y

x-y 这是小学题目么?