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
答
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