问题标题:
lim(n→正无穷)(1+1/2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)=
问题描述:

lim(n→正无穷)(1+1/2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)=

汪恩清回答:
  (1+1/2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)=2(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)   =2(1-1/2^2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)   =2(1-1/2^4n)   lim(n→正无穷)(1+1/2)(1+1/2^2)(1+1/2^4)...(1+1/2^2n)   lim(n→正无穷)2(1-1/2^4n)=2
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