化简求值:(x-1-- x+1分之8)除以x+1 分之x+3,其中X=3--根号2

问题描述:

化简求值:(x-1-- x+1分之8)除以x+1 分之x+3,其中X=3--根号2

(x-1- x+1分之8)除以x+1 分之x+3
=(x²-1-8)/(x+1) × (x+1)/(x+3)
=(x+3)(x-3)/(x+1)× (x+1)/(x+3)
=x-3
=3-√2-3
=-√2