378－25÷975＝378－1/39＝377.38/39即商差是377.38/39
378-25÷975=378-1/39=377+1-1/39=377又38/39
378一25/975=378一1/39=（378Ⅹ39一1)/39=（14742-1）/39=14741/39=377.974359
378-25÷975＝378-0.26≈377.74
