先将代数式[x-(x/x+1)]/[1+(1/x^2-1)]化简,再从-3

Question

先将代数式[x-(x/x+1)]/[1+(1/x^2-1)]化简,再从-3

Answer 1

[x-(x/x+1)]/[1+(1/x^2-1)]
=(x²+x-x)/(x+1)×(x+1)(x-1)/x²
=x-1
当x=0时
原式=x-1=-1