4.25*0.99+0.01

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4.25*0.99+0.014.25*0.99+0.014.25*0.99+0.014.25*0.99+0.01=4.25*1-4.25*0.01+0.01=4.25-0.0425+0.01=4.20

4.25*0.99+0.01
4.25*0.99+0.01

4.25*0.99+0.01
4.25*0.99+0.01
=4.25*1 - 4.25*0.01+0.01
=4.25 - 0.0425+0.01
=4.2075+0.01
=4.2175

原式等于4.25×(1-0.01)+0.01=4.25-4.25×0.01+0.01=4.25+0.01×(1-4.25)=4.25-0.0325=4.2175