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設新多邊形的邊數為n,則(n-2)•180°=2520°,解得n=16,①若截去一個角後邊數新增1,則原多邊形邊數為15,②若截去一個角後邊數不變,則原多邊形邊數為16,③若截去一個角後邊數减少1,則原多邊形邊數為17,所以多邊形的邊數可以為15,16或17.故答案為:15,16或17.
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