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O.999x0.7+0.111x3.7簡便算法

O.999xO.7+O.111x3.7 =0.111*(6.3+3.7) =0.111*10

0.999x1.3一0.111x1.7 =0.111x9x1.3=0.111x1.7 =0.11

=0.111x9x1.3一0.111x1.7 =0.111x(11.7一1.7) =0.111x10

簡便方法計算如下: 999×0.7+111×3.7 =111x9x0.7+111x3.7 =

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