用简便方法计算式子:12.3×(-87)-12.3×28+12.3×15
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用简便方法计算式子:12.3×(-87)-12.3×28+12.3×15
用简便方法计算式子:12.3×(-87)-12.3×28+12.3×15
用简便方法计算式子:12.3×(-87)-12.3×28+12.3×15
12.3x(-87-28+15)=12.3x(-115+15)=12.3x(-100)= -1230