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0既不是正數也不是負數,而是正數和負數之間的一個數.當某個數X大於0(X>0)時,稱為正數;反之,當X小於0(X
-7是有理數、整數 -3.14是有理數、分數、負分數 0是有理數、整數、自然數 2/3是有理數、分數、
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