问题描述: 约分(初二数学的分式)x²+y²-9-2xy/x²-y²+6x+9 1个回答 分类:数学 2014-10-07 问题解答: 我来补答 (x²+y²-9-2xy)/(x²-y²+6x+9) =[(x-y)²-3²]/[(x+3)²-y²] =(x-y-3)(x-y+3)/(x-y+3)(x+y+3) =(x-y-3)/(x+y+3) 展开全文阅读