lim(1/3+1/9+1/27+…(1/3)^n)

问题描述:

lim(1/3+1/9+1/27+…(1/3)^n)
RT

1/3+1/9+1/27+…(1/3)^n
=1/2-1/2(1/3)^n
lim(1/3+1/9+1/27+…(1/3)^n)=1/2