问题描述: [(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x这题怎么做麻烦拉... 1个回答 分类:数学 2014-11-26 问题解答: 我来补答 [(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/4x=[(9x^2-4y^2)-(5x^2+8xy-4y^2)]/4x=(9x^2-4y^2-5x^2-8xy+4y^2)/4x=(4x^2-8xy)/4x=x-2y 展开全文阅读