0.38×6.2-0.12×3.8简便计算,

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0.38×6.2-0.12×3.8简便计算,0.38×6.2-0.12×3.8简便计算,0.38×6.2-0.12×3.8简便计算,1.90.38×(6+0.2)-0.12×(4-0.2)=0.38×

0.38×6.2-0.12×3.8简便计算,
0.38×6.2-0.12×3.8简便计算,

0.38×6.2-0.12×3.8简便计算,

1.9

0.38×(6+0.2)-0.12×(4-0.2)=0.38×6+0.38×2-0.12×4-0.12×0.2=2.28+0.76-0.48-0.024

原式=0.38×6.2-0.38×1.2=0.38×(6.2-1.2)=0.38×5=1.9