问题描述: 当m=-3,n=1/2时m^2n+[2mn^2-(3m^2n-2mn^2)] 1个回答 分类:数学 2014-12-01 问题解答: 我来补答 当m=-3,n=1/2时m^2n+[2mn^2-(3m^2n-2mn^2)]=m^2n+2mn^2-3m^2n+2mn^2=-2m^2n+4mn^2=-2mn(m-2n)=-2x(-3)x1/2x(-3-2x1/2)=6x1/2x(-4)=-12 展开全文阅读