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兩個自然數的和與差的奇偶性相同,即同是奇數或同是偶數. 1996=2×998(只能分成這樣兩個同是偶數的積) 所以,這兩數的差是2,和是998,這樣就變成了一個和差問題 這兩個數分別是:(2+998)÷2=500500-2=498.
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