1/(x+1)+1/(x+8)=1/(x+6)+1/(x+7)1/(x+1)-1/(x+6)=1/(x+7)-1/(x+8)5/(x+1)(x+6)=1/(x+7)(x+8) (x+1)(x+6)=5(x+7)(x+8) x^2+7x+6=5x^2+75x+280 4x^2+68x+274=0 2x^2+34x+137=0 x=(-34±√60)/4=(-17±√15)/2
同学,题目搞错了吧,这样做下去,x都没有了