A guess is an attempt to give the right answer when you are not certain if you are correct. Irr函数包含（value，guess） 属于 非线性方程，求出值有可能包含2个或多个值，另外excel并非专业数学计算软件，无法直接算出输入，运用的是 牛顿迭代法 计算内部收益率，需要给出一.
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