lim[(12+22+32+…+n2)÷n3]的解法?
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lim[(12+22+32+…+n2)÷n3]的解法?
lim[(12+22+32+…+n2)÷n3]的解法?
lim[(12+22+32+…+n2)÷n3]的解法?
连个 趋向都没 解什么
1/6n(n+1)(2n+1)
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