3.9+0.39+0.039+0.0039+0.00039
=4-0.1+0.4-0.01+0.04-0.001+0.004-0.0001+0.0004-0.00001
=4.4444-0.11111
=4.3333-0.00001
=4.33329
3.9+0.39+0.039+0.0039+0.00039
=4+0.4+0.04+0.004+0.0004-(0.1+0.01+0.001+0.0001+0.00001)
=4.4444-0.11111
=4.33329
=(390000+39000+390+390+39)除以10000= 433329除以10000=4.33329
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