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1又2分之1 2又4分之1 3又8分之1 . 根據以上數據,可以得出這個數列的通項公式是 an=n+1/2^n 所以求第五個數把5代進去,得 a5=5+1/32=5又1/32 第n個數=n+1/2^n(n=1,2,3……) 則第五個數是(5又1/32),第n個數是(n+1/2^n,即n又2的n次方分之1)
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