66.6乘33.3怎么巧算_数学解答

66.6乘33.3怎么巧算

人气：369 ℃　时间：2020-02-20 04:55:31

解答

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