66.6乘33.3怎么巧算

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66.6乘33.3怎么巧算66.6乘33.3怎么巧算66.6乘33.3怎么巧算原式=666×333/100=222×3×333/100=222×999/100=2.22×(1000-1)=2220-2

66.6乘33.3怎么巧算
66.6乘33.3怎么巧算

66.6乘33.3怎么巧算
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

11.1×11.1×6×3

2217.78