化简(x-3分之1-x的平方-1分之x+1)乘以(x-3)的结果是
问题描述:
化简(x-3分之1-x的平方-1分之x+1)乘以(x-3)的结果是
答
=[1/(x-3)-(x+1)/(x+1)(x-1)]×(x-3)
=1-(x-3)/(x-1)
=2/(x-1)