66.6乘33.3怎么巧算

分类: 作业答案 • 2021-12-20 05:42:02

问题描述：

66.6乘33.3怎么巧算

答

2217.78

答

11.1×11.1×6×3

答

原式=666×333/100
=222×3×333/100
=222×999/100
=2.22×（1000-1）
=2220-2.22
=2217+3-2.22
=2217+0.78
=2217.78