﹙颤销x-1﹚﹙茄如游x+2﹚=0解为∶橡颂﹣2和1前式化简为∶1/x﹣1代入1 不合理,代入﹣2得﹣1/3
(x+1)(x+1)/(x+1)(x-1) -x/(x-1)=(x+1)/(x-1) -x/(x-1)=1/余尘(x-1)x是: x=1 或x=-2x=1时,1/(1-1),无意竖型禅租橡义x=-2时,1/(-2-1) =-1/3参考