求推导一个数学数列公式n^2+(n-1)^2+(n-2)^2+...+1=n*(n+1)*(2*n+1)/6求推导过程...
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![求推导一个数学数列公式n^2+(n-1)^2+(n-2)^2+...+1=n*(n+1)*(2*n+1)/6求推导过程...](/uploads/image/z/1999894-22-4.jpg?t=%E6%B1%82%E6%8E%A8%E5%AF%BC%E4%B8%80%E4%B8%AA%E6%95%B0%E5%AD%A6%E6%95%B0%E5%88%97%E5%85%AC%E5%BC%8Fn%5E2%2B%28n-1%29%5E2%2B%28n-2%29%5E2%2B...%2B1%3Dn%2A%28n%2B1%29%2A%282%2An%2B1%29%2F6%E6%B1%82%E6%8E%A8%E5%AF%BC%E8%BF%87%E7%A8%8B...)
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