问题描述: (1)2(a^2-ab)-2a^2+3ab (2)5(2x-7y)-3(4x-10y) (3)(x+y)-[3x+(-x+y)] 1个回答 分类:数学 2014-10-13 问题解答: 我来补答 2(a^2-ab)-2a^2+3ab =2a²-2ab-2a²+3ab=ab5(2x-7y)-3(4x-10y)=10x-35y-12x+30y=-2x-5y(x+y)-[3x+(-x+y)] =x+y-3x-(-x+y)=-2x+y+x-y=-x 展开全文阅读