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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