2003×0.999-2004×0.998巧算

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2003×0.999-2004×0.998巧算
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2003×0.999-2004×0.998巧算
2003×0.999-2004×0.998巧算

2003×0.999-2004×0.998巧算
2003*0.999-2004*0.998
=2003*0.999-(2003+1)*0.998
=2003*0.999-2003*0,998-0.998
=2003*(0.999-0.998)-0.998
=2003*0.001-0.998
=2.003-0.998
=1.005

把2004拆成2003加1,展开,再把得到的式子的2003提取出来

2003×0.999-2004×0.998
=2003×(1-0.001)-2004×(1-0.002)
=2003-2.003-2004+4.008
=1.005

2003×0.999-2004×0.998
=2003×0.999-2004×0.999+2004×0.001
=(2003-2004)×0.999+2004×0.001
=-0.999+2.004
=-1+2.004+0.001
=1.005
满意请采纳~~~