1)9 天。按等差級數原理,少一頭牛即加3天,所以一頭牛需9天。
2)你若沒給SSN就還好,下回注意些。
1)9 天。按等差級數原理,少一頭牛即加3天,所以一頭牛需9天。
2)你若沒給SSN就還好,下回注意些。
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