化简求值:x(x-y)2-x2-y2x+y+(2x+2x-y-2),其中x,y满 发布时间:2017-04-15 13:44 │ 来源:www.tikuol.com 题型:解答题 问题: 化简求值:x(x-y)2-x2-y2x+y+(2x+2x-y-2),其中x,y满足方程组x+2y=3x-y=2.