先将分式(1+x-1分之3)÷(x+2)/(x²-1)进行化简,然后请你给x选择一个合适的值,求原式的值.

问题描述:

先将分式(1+x-1分之3)÷(x+2)/(x²-1)进行化简,然后请你给x选择一个合适的值,求原式的值.

原式=[(x-1+3)/(x-1)]×[(x+1)(x-1)/(x+2)]
=(x+2)(x+1)(x-1)/[(x-1)(x+2)]
=x+1