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5個有理數相乘,它們的積為負數,負因數有1個、3個或5個(奇數個)
實數:包括有理數和無理數, 有理數:包括整數,分數——————無理數:無限不循環小數 整數:包括正整數,0,負整數,其中(0和正整數是自然數) 分數:正分數和負分數.
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