问题描述: (x的m+n次方)²×(-x的m-n次方)³+x的2m-n次方×(-x³) 1个回答 分类:数学 2014-11-26 问题解答: 我来补答 原式=x^2(m+n)*[-x^3(m-n)]-x^(2m-n+3)=x^(2m+2n)*[-x^(3m-3n)]-x^(2m-n+3)=-x^(2m+2n+3m-3n)-x^(2m-n+3)=-x^(5m-n)-x^(2m-n+3) 展开全文阅读