lim[2^﹙2n+1﹚+9^n]/[4^n-9^n]

问题描述:

lim[2^﹙2n+1﹚+9^n]/[4^n-9^n]

=lim[2*4^n+9^n]/[4^n-9^n]
=lim[2*(4/9)^n + 1]/[(4/9)^n - 1]
=[2*0+1]/[0-1]
=-1