1的平方+2的平方+3的平方+.+1992的平方的和的末尾数字是几?还没有学过1^2+2^2.....n^2=[n(n+1)(2n+1)]/6这种公式。请各位高手采用“平方数的尾数”的奥数方法解题吧
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![1的平方+2的平方+3的平方+.+1992的平方的和的末尾数字是几?还没有学过1^2+2^2.....n^2=[n(n+1)(2n+1)]/6这种公式。请各位高手采用“平方数的尾数”的奥数方法解题吧](/uploads/image/z/646916-68-6.jpg?t=1%E7%9A%84%E5%B9%B3%E6%96%B9%2B2%E7%9A%84%E5%B9%B3%E6%96%B9%2B3%E7%9A%84%E5%B9%B3%E6%96%B9%2B.%2B1992%E7%9A%84%E5%B9%B3%E6%96%B9%E7%9A%84%E5%92%8C%E7%9A%84%E6%9C%AB%E5%B0%BE%E6%95%B0%E5%AD%97%E6%98%AF%E5%87%A0%3F%E8%BF%98%E6%B2%A1%E6%9C%89%E5%AD%A6%E8%BF%871%5E2%2B2%5E2.....n%5E2%3D%5Bn%EF%BC%88n%2B1%EF%BC%89%EF%BC%882n%2B1%EF%BC%89%5D%2F6%E8%BF%99%E7%A7%8D%E5%85%AC%E5%BC%8F%E3%80%82%E8%AF%B7%E5%90%84%E4%BD%8D%E9%AB%98%E6%89%8B%E9%87%87%E7%94%A8%E2%80%9C%E5%B9%B3%E6%96%B9%E6%95%B0%E7%9A%84%E5%B0%BE%E6%95%B0%E2%80%9D%E7%9A%84%E5%A5%A5%E6%95%B0%E6%96%B9%E6%B3%95%E8%A7%A3%E9%A2%98%E5%90%A7)
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