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零是自然數並且最小的自然數是零對 丌是無理數 有理數可分為正數和負數不對,還有0 3點25是小數不是有理數不對它是有理數
自然數、小數、分數、負數、正數產生的時間先後順序是自然數、分數、小數、正數負數
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