[(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:2024/05/27 20:51:23

[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y

x-y 这是小学题目么?