问题描述: 解方程:1/x+2-1/x-8=1/x+3解方程:1/x+2-1/x-8=1/x+3-1/x+9 1个回答 分类:数学 2014-12-03 问题解答: 我来补答 答:1/(x+2)-1/(x-8)=1/(x+3)-1/(x+9)[(x-8)-(x+2)]/[(x+2)(x-8)]=[(x+9)-(x+3)]/[(x+3)(x+9)]-10/(x^2-6x-16)=6/(x^2+12x+27)-10x^2-120x-270=6x^2-36x-9616x^2+84x+174=08x^2+42x+87=0判别式=42^2-4*8*87=-1020 展开全文阅读