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Exact value is the value that is correct in measurements, such as cm, km, and etc. It is widely used in fields of science and math.

However, true value is used when reviewing the art work, or etc., such as saying this piece of art drawn by somebody has a true value. It means that it is very high when estimating the value of a certain thing. It is widely used in fields of ART.

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Q: What is the difference between exact value and true value?
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