按规律填数:2.51,0.4,(),(),0.0256.

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按规律填数:2.51,0.4,(),(),0.0256.
按规律填数:2.51,0.4,(),(),0.0256.

按规律填数:2.51,0.4,(),(),0.0256.
0.16 0.064
an=2^(2n-4)/10^(n-2)
你在2.5和1中间少了个逗号,害我费了半天劲.

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