lim(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
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设S=(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
(1-1/2)S=(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
(1-1/2)S=(1-1/2^2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
(1-1/2)S=(1-1/2^4)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
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(1-1/2)S=(1+1/2^(n+1))
S=2*(1+1/2^(n+1))
N趋向无穷大 S趋向2
(1-1/2)S=(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
(1-1/2)S=(1-1/2^2)(1+1/2^2)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
(1-1/2)S=(1-1/2^4)(1+1/2^4)(1+1/2^8)……(1+1/2^n)
..
..
..
(1-1/2)S=(1+1/2^(n+1))
S=2*(1+1/2^(n+1))
N趋向无穷大 S趋向2
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