0.9999×0.8+0.1111×1.8 巧算

分类: 作业答案 • 2021-12-28 16:34:05

问题描述：

答

0.9999×0.8+0.1111×1.8
=0.1111×9×0.8+0.1111×1.8
=0.1111×7.2+0.1111×1.8
=0.1111×(7.2+1.8)
=0.1111×9
=0.9999