x趋近于1,(1-x)^2/(x^2-1)^2等于几?

问题描述:

x趋近于1,(1-x)^2/(x^2-1)^2等于几?

原式=lim(x-1)²/(x+1)²(x-1)²
=lim1/(x+1)²
=1/4