问题描述： {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y 1个回答 分类：数学 2014-11-21 问题解答： 我来补答 (x-y)(z+y-x+y+2y)÷4y=(x-y)(z-x+4y)÷4y{( x +y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y=(x-y)(x+y-x+y+2y)÷4y=(x-y)(4y)÷4y=x-y 展开全文阅读
