1240*3.8+124*63-12.4*10简便算法怎么算

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1240*3.8+124*63-12.4*10简便算法怎么算
1240*3.8+124*63-12.4*10简便算法怎么算

1240*3.8+124*63-12.4*10简便算法怎么算
1240*3.8+124*63-12.4*10
=124*38+124*63-124*1
=124*(38+63-1)
=124*100
=12400

1240*3.8+124*63-12.4*10
=124*38+124*63-124
=124*(38+63-1)
=124*100
=12400

1240×3.8+124×63-12.4×10
=124×10×3.8+124×63-124×1
=124×38+124×63-124×1
=124×(38+63-1)
=124×100
=12400

原式=124x38+124x63-124x1
=124x(38+63-1)
=124x100
=12400