3.8-2.09怎么验算?

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3.8-2.09怎么验算?
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3.8-2.09怎么验算?
3.8-2.09怎么验算?

3.8-2.09怎么验算?
3.8-2.09=1.71
验算:1.71+2.09=3.8
或者:3.8-1.71=2.09

3.8-2.09=1.71
验算1.71+2.09=3.8

1.71,验算就用1.71+2.09,看看是否等于3.8即可