34.5乘76.5减345乘6.42减123乘1045简便方法

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34.5乘76.5减345乘6.42减123乘1045简便方法
34.5乘76.5减345乘6.42减123乘1045简便方法

34.5乘76.5减345乘6.42减123乘1045简便方法
34.5乘76.5减345乘6.42减123乘10.45
=34.5乘76.5减34.5乘64.2减123乘10.45
=34.5×(76.5-64.2)-123×10.45
=34.5×12.3-12.3×104.5
=12.3×(34.5-104.5)
=12.3×(-100)
=-1230