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