3.8*9.9+0.38 简便计算

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3.8*9.9+0.38简便计算3.8*9.9+0.38简便计算3.8*9.9+0.38简便计算3.8*9.9+0.38=3.8*9.9+3.8*0.1=3.8*(9.9+0.1)=3.8*10=38

3.8*9.9+0.38 简便计算
3.8*9.9+0.38 简便计算

3.8*9.9+0.38 简便计算
3.8*9.9+0.38
=3.8*9.9+3.8*0.1
=3.8*(9.9+0.1)
=3.8*10
=38

3.8*9.9+0.38
=0.38×99+0.38
=0.38×100
=38