5.9*9.9+0.59怎么简便算

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5.9*9.9+0.59怎么简便算
5.9*9.9+0.59怎么简便算

5.9*9.9+0.59怎么简便算
5.9*9.9+0.59
=0.59*99+0.59
=0.59*(99+1)
=0.59*100
=59

=5.9*9.9+5.9*0.1=5.9*(9.9+0.1)=5.9*10=59

5.9*9.9+0.59
=5.9*9.9+5.9*0.1
=5.9*(9.9+0.1)
=5.9*10
=59

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