老師吖，平滑指數(shù)0.6，用實(shí)際數(shù)×0.6+預(yù)測數(shù)×0.4＝（實(shí)際數(shù)-預(yù)測數(shù)）×0.6+預(yù)測數(shù) 我是用后面這樣算出來的，答案一致，應(yīng)該沒事吧