2003*0.999减2004*0.998 简便计算

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2003*0.999减2004*0.998 简便计算
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2003*0.999减2004*0.998 简便计算
2003*0.999减2004*0.998 简便计算

2003*0.999减2004*0.998 简便计算
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

=2003*(1-0.001)-2004*(1-0.002)=2.003-2004-2.003+2*2.004=1.005