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. Guess这个字可以接介系词at，也可以不加，区别如下： 一、guess这个字加介系词at，表示猜的动作，猜想某件事物是怎样发生的，但不一定猜对，如： the suit was faultless:.
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