X-1分之X²-1当值为0时,X的值为多少?

X-1分之X²-1当值为0时,X的值为多少?
X-1分之X²-1当值为0时,X的值为多少?

X-1分之X²-1当值为0时,X的值为多少?
X^2-1=0
所以X=1或者X=-1
但是分母不为零,
所以X=-1

（x^2-1)/(x-1)
=(x+1)(x-1)/(x-1)
=x+1=0
则x=-1