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這個很簡單呀,四個連續自然數,都是整數,3024個位數是4,所以他裡邊不可能出現個位是5或者0的數.所以這四個數一定個位是1234或6789的數.鑒於四個兩位數,最小的積也在五位以上,所以這四個數只能是6.7.8.9,所以,他們的和是6+7+8+9=30
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