问题描述: 已知|x+2|+2(y-1/2)^2=0.求代数式3y^2-6x^2y-4y^2+2x^2y的值 1个回答 分类:数学 2014-10-15 问题解答: 我来补答 ∵|x+2|≥0,(y-1/2)^2≥0,且|x+2|+2(y-1/2)^2=0∴x+2=0,y-1/2=0 ==>x=-2,y=1/2故3y^2-6x^2y-4y^2+2x^2y=-4x^2y-y^2=-4(-2)^2*(1/2)-(1/2)^2=8-1/4=31/4. 展开全文阅读