问题描述: 解方程:(x-4)/(x-5)-(x-5)/(x-6)=(x-7)/(x-8)-(x-8)/(x-9) 1个回答 分类:数学 2014-10-15 问题解答: 我来补答 (x-4)/(x-5)-(x-5)/(x-6)=(x-7)/(x-8)-(x-8)/(x-9)1+1/(x-5)-1-1/(x-6)=1+1/(x-8)-1-1/(x-9)1/(x-5)-1/(x-6)=1/(x-8)-1/(x-9)通分:-1/[(x-5)(x-6)]=-1/[(x-8)(x-9)](x-5)(x-6)=(x-8)(x-9)x^2-11x+30=x^2-17x+726x=42x=7 展开全文阅读