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:. Irr函数的语法结构 irr (values, [guess]) 参数说明： values 数组或单元格的引用，这些单元格包含用来计算内部收益率的数字。 values 必须包含至少一个正值和一个负值，以计算返回的内.
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