簡便計算！1.2.5×9.8 2.1.25×25×3.2 3.2.4-1.375+5分之3 4.3分之1÷7分之3×14分之5

1.2.5×9.8
=2.5x（10-0.2）
=2.5x10-2.5x0.2
=25-0.5
=24.5
2.1.25×25×3.2
=（1.25x8）x（0.4x25）
=10x10
=100
3.2.4-1.375+5分之3
=2.4-+0.6-1.375
=3-1.375
=1.625
4 3分之1÷7分之3×14分之5
=1/3x7/3x5/14
=5/18

簡便計算！1.2.5×9.8 2.1.25×25×3.2 3.2.4-1.375+5分之3 4.3分之1÷7分之3×14分之5

簡便計算！1.2.5×9.8 2.1.25×25×3.2 3.2.4-1.375+5分之3 4.3分之1÷7分之3×14分之5

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