lim[1+X^(-2)]^x=lim[1+(1/x)^2]^e=lim e^ln(1+1/x^2)^x=e^lim xln(1+1/x^2)=e^lim 1/x=e^0=1x→+∞ x→+∞ x→+∞ x→+∞ x→+∞请采纳~~!