求各式极限③lim(x→无穷)(1+x分之2)的x次方④lim(x→无穷)x的n次方分之lnx(n﹥0)

③lim(x→∞)(1+2/x)^x
=lim(x→∞)[(1+2/x)^(x/2)]^
=e^.
④lim(x→∞)lnx/（x^n)(n﹥0)
=lim(x→∞)1/(nx^n)
=0.