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區別有兩點:第一,有理數和無理數都寫成小數形式時,有理數能寫成有限小數或無限循環小數,無理數能寫成無限不循環小數;第二,所有的有理數都可以寫成兩個整數之比,而無理數卻不能寫成兩個整數之比.
有理數就是有限小數以及無限循環小數.無理數是無限不循環小數.
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