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分析:若已知n的具體數值,求1×2×…×n的尾部零的個數,則比較容易解決,現在反過來知道尾部零的個數,求n的值,不大好處理,我們可以先估計n大約是多少,然後再仔細確定n的值.因此,乘積1×2×3×…×400中含質因數5的個...
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