简便方法计算9.01×1.55+9.02×1.54+9.03×1.53+9.04×1.52

9.01×1.55+9.02×1.54+9.03×1.53+9.04×1.52=9.01×1.55+9.02×(1.55-0.01)+9.03×(1.55-0.02)+9.04×(1.55-0.03)=9.01×1.55+9.02×1.55-9.02×0.01+9.03×1.55-9.03×0.02+9.04×1.55-9.04×0.03=(9.01+9.02+9.0...