2.45乘以0.16乘以80怎么简便法?

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2.45乘以0.16乘以80怎么简便法?
2.45乘以0.16乘以80怎么简便法?

2.45乘以0.16乘以80怎么简便法?
2.45乘以0.16乘以80
=2.45×20×（4×0.16）
=49×0.64
=（50-1）×0.64
=50×0.64-0.64
=32-0.64
=31.36

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