2007×0.999-2008×0.998简便计算

分类: 作业答案 • 2022-01-02 13:33:48

问题描述：

答

2007×0.999-2008×0.998
=2007*0.999-(2007+1)*0.998
=2007*0.999-2007*0.998-0.998
=2007*(0.999-0.998)-0.998
=2007*0.001-0.998
=2.007-0.998
=1.009

答

2007×0.999-2008×0.998
=2007×0.999-2008×0.999+2008×0.001
=0.999×(2007-2008)+2.008
=0.999×(-1)+2008
=2.008-0.999
=1.009

答

=2007×0.999-2007×0.998-0.998
=2007×(0.999-0.998)-0.998
=2.007-(1-0.002)
=2.007-1+0.002
=1.009