问题描述: 计算 (1/3a^2b)^2*(-9ab^3)/(-1/2a^4b^2) 因式分解:4x^2(x-y)+(y-x)急. 1个回答 分类:数学 2014-11-11 问题解答: 我来补答 (1/3a^2b)^2*(-9ab^3)/(-1/2a^4b^2) =(1/9a^4b^2*-9ab^3)/(-1/2a^4b^2)=2ab^34x^2(x-y)+(y-x)=(x-y)(4x^2-1)=(x-y)(2x-1)(2x+1) 展开全文阅读