问题描述: (x的2次方-9)分之12+(3-x)分之2 1个回答 分类:数学 2014-11-11 问题解答: 我来补答 12/(x+3)(x-3)+2/(3-x)=12/(x+3)(x-3)-2/(x-3)=[12-2(x+3)]/(x+3)(x-3)=2(3-x)/(x+3)(x-3)=-2/(x+3) 展开全文阅读