7.8*9.9+0.78的简便计算
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7.8*9.9+0.78的简便计算
7.8*9.9+0.78的简便计算
7.8*9.9+0.78的简便计算
7.8*9.9+7.8*0.1
=7.8*(9.9+0.1)
=7.8*10
=78
=0.78*99+0.78*1
=0.78*(99+1)
=0.78*100
=78