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(1+1/2)(1+1/4)(1+1/16)(1+1/256)…(1+1/2的2n次方)
题目详情
(1+1/2)(1+1/4)(1+1/16)(1+1/256)…(1+1/2的2n次方)
▼优质解答
答案和解析
原式=2*(1-1/2)(1+1/2)(1+1/4)(1+1/8)……(1+1/2^2^n)
=2*(1-1/4)(1+1/4)(1+1/8)……(1+1/2^2^n)
=2*(1-1/8)(1+1/8)……(1+1/2^2^n)
反复用平方差
=2*[1-1/2^(2^(n+1))]
=2-2/2^(2^(n+1))]
不懂请追问,满意请给好评,谢谢了.
=2*(1-1/4)(1+1/4)(1+1/8)……(1+1/2^2^n)
=2*(1-1/8)(1+1/8)……(1+1/2^2^n)
反复用平方差
=2*[1-1/2^(2^(n+1))]
=2-2/2^(2^(n+1))]
不懂请追问,满意请给好评,谢谢了.
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