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Syntax structure of Irr function irr (values, [guess]) Parameter description: values are references to arrays or cells. These cells contain numbers used to calculate the internal rate of return. values must contain at least one positive value and one negative value to calculate the returned value. The word "guess" can be followed by the preposition "at" or not. The difference is as follows: 1. The word "guess" is added by the preposition "at" to express the action of guessing, guessing how something happened, but the guess may not be correct, such as: the suit was faultless:. The Irr function contains (value, guess) and is a non-linear equation. The calculated value may contain 2 or more values. In addition, Excel is not a professional mathematical calculation software and cannot directly calculate the input. The Newton iteration method is used to calculate the internal rate of return, and one needs to be given.

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