0.9999×0.8+0.1111×1.8 巧算

分类: 作业答案 • 2021-12-19 15:54:12

问题描述：

答

0.9999×0.8+0.1111×1.8
=0.9999×0.8+0.1111×(1+0.8)
=0.9999×0.8+0.1111×0.8+0.1111x1
=(0.9999+0.1111)x0.8+0.1111
=1.111x0.8+0.1111
=0.8888+0.1111
=0.9999

答

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

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