asd2008
幼苗
共回答了14个问题采纳率：78.6% 举报
Xn = (1+1/2)(1+1/4).(1+1/2^(2n))
所以
(1-1/2)Xn = (1-1/2)(1+1/2)(1+1/4).(1+1/2^(2n))
所以
(1-1/2)Xn = (1-1/4)(1+1/4).(1+1/2^(2n))=（1-1/16）...(1+1/2^(2n))
=（1-1/2^(2n))(1+1/2^(2n)) = 1-1/4^(2n)
所以得到
Xn = 2(1-1/4^(2n)) -> 2
1年前
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