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此函数通过将LAMBDA函数应用于每个值并返回累加器中的总值，将数组缩减为累加值。
REDUCE([initial_value], array, lambda(accumulator, value))
REDUCE函数有下列参数：
| 参数名 | 描述 |
|---|---|
| [initial_value] | [可选]设置累加器的起始值。 |
| array | 要缩减的数组。 |
| lambda | 被调用的LAMBDA函数，用来缩减数组。 LAMBDA函数包含两个参数： |
如果提供了无效的 LAMBDA 函数或参数数量不正确，则返回 #VALUE！错误，称为“参数不正确”的错误。
返回一个数值。
REDUCE(, A1:C2, LAMBDA(a,b,a+b^2))
REDUCE(1,Table2[Nums],LAMBDA(a,b,IF(b>50,a+b,a)))