3.8*9.9+0.38 简便计算
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![3.8*9.9+0.38 简便计算](/uploads/image/z/131754-66-4.jpg?t=3.8%2A9.9%2B0.38+%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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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
=0.38×99+0.38
=0.38×100
=38