问题描述: 2-3xy-10y~2+x+9Y-2因式分解 1个回答 分类:数学 2014-12-03 问题解答: 我来补答 添项、拆项,得 x^2-3xy-10y^2+x+9y-2 =(x+2y)(x-5y)+2x+4y-x+5y-2 =(x+2y)(x-5y)+2(x+2y)-(x-5y+2) =(x+2y)(x-5y+2)-(x-5y+2) =(x+2y-1)(x-5y+2) 展开全文阅读