12.5x0.38+1.25x4.2+0.125x20如何用简便方法计算

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12.5x0.38+1.25x4.2+0.125x20如何用简便方法计算

12.5x0.38+1.25x4.2+0.125x20如何用简便方法计算
12.5x0.38+1.25x4.2+0.125x20如何用简便方法计算

12.5x0.38+1.25x4.2+0.125x20如何用简便方法计算
12.5x0.38+1.25x4.2+0.125x20
=12.5×0.38+12.5×0.42+12.5×0.2
=12.5×(0.38+0.42+0.2)
=12.5×1
=12.5