3.9 0.39 0.039 0.0039 0.00039计算题怎么算

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3.9 0.39 0.039 0.0039 0.00039计算题怎么算
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3.9 0.39 0.039 0.0039 0.00039计算题怎么算
3.9 0.39 0.039 0.0039 0.00039计算题怎么算

3.9 0.39 0.039 0.0039 0.00039计算题怎么算
3.9+0.39+0.039+0.0039+0.00039
=3.9*(1+0.1+0.01+0.001+0.0001)
=3.9*1.1111
=4.33329

3.9+0.39+0.039+0.0039+0.00039
=3.9*(1+0.1+0.01+0.001+0.0001)
=3.9*1.1111
=4.33329