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4.25×9.9+42.5的简算怎么算

4.25*9.9+42.5的简算4.25*9.9+42.5=4.25*9.9+4.25*0.1=4.25*(9.9+0.1)=4.25*10=42.5

这道题这样算,利用乘法结合律.算式4.25*(9.9+0.1)=42.5

4.25x9.9+42.5等于4.25x10-0.1x4.25+42.5=42.5-0.425+42.5=84.575

4.25+9.9x42.5=4.25+9.9*4.25*10=4.25+99*4.25=100*4.25=425

4.25*(10-0.1)=4.25*10-4.25*0.1=42.5-0.425=42.075

4.25*9.9=4.25*(10-0.1)=4.25*10-4.25*0.1=42.5-0.425=42.075

36.72÷4.25x9.9=8.16x9.9=8.16*(10-0.1)=8.16*10-8.16*0.1=81.6-0.816=80.784

可以这样简算: 4.25X90十42.5=4.25Ⅹ(100一10)十42.5=425一42.5十42.5=425

36.25÷4.25*9.9=(36.25*4)÷(4.25*4)*9.9=145÷17*9.9=[145*(10-0.1)]÷17=(145*10-145*0.1)÷17=(1450-14.5)÷17=1435.5÷17

提取公因式: 9.4*42.5+4.25*60=42.5*(9.4+6) =42.5*15.4 =654.5 望采纳 谢谢您.

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