问题描述: 当2x-y\x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的値. 1个回答 分类:数学 2014-10-02 问题解答: 我来补答 2x-y\x+y=32x-y=3(x+y)2x-y=3x+3y3x-2x=-y-3yx=-4y 2x-y/2x+2y+x+y/6x-3y=(-8y-y)/(-8y+2y)+(-4y+y)/(-24y-3y)=3/2+1/9=29/18 展开全文阅读