问题描述： 化简：1/(x+3)-6/(x²-9)-(x-1)/(6+2x) 1个回答 分类：数学 2014-10-05 问题解答： 我来补答 1/(x+3)-6/(x²-9)-(x-1)/(6+2x) =1/(x+3)-6/(x-3)(x+3)-(x-1)/2(x+3)=2(x-3)/2(x-3)(x+3)-12/2(x-3)(x+3)-(x-1)(x-3)/2(x-3)(x+3)=[2(x-3)-12-(x-1)(x-3)]/2(x-3)(x+3)=[2x-6-12-x^2+4x-3]/2(x-3)(x+3)=(-x^2+6x-21)/2(x-3)(x+3)=-(x^2-6x+21)/2(x-3)(x+3). 展开全文阅读
