1.1111×1.9999-0.1111×0.9999

分类: 作业答案 • 2023-01-06 01:59:50

问题描述：

1.1111×1.9999-0.1111×0.9999
怎么简便算啊

答

1.1111×1.9999-0.1111×0.9999
=（1+0.1111）×（1+0.9999）-0.1111×0.9999
=1+0.9999+0.1111+0.1111×0.9999-0.1111×0.9999
=1+1.111
=2.111