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這個要看是否考慮正負的問題.(1)若是正的真分數且乘的這個任意數也是正的,由於真分數的絕對值是小於1的數,在正數時則可以說是小於1的,一個數在乘以一個小於1的數時,積一定小於原來的值.即是對的.(2)若是正的真分…
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