先将代数式(x-x+1/x)÷(1+x²-1/1)化简,再从-3

问题描述:

先将代数式(x-x+1/x)÷(1+x²-1/1)化简,再从-3

1

??好怪

(x-x+1/x)÷(1+x²-1/x)
=(x²-x+1)/x÷(x²+x²-1)/x
=(x²-x+1)/(2x²-1) x=0
=(0-0+1)/(0-1)
=1/(-1)
=-1