就是用代数几何平均不等式, (1+a_k)^k = ((k-1)*(1/(k-1)) + a_k)^k >= k^k/(k-1)^(k-1)*a_k. 然后乘起来, 最后发现等式取不到。
就是用代数几何平均不等式, (1+a_k)^k = ((k-1)*(1/(k-1)) + a_k)^k >= k^k/(k-1)^(k-1)*a_k. 然后乘起来, 最后发现等式取不到。
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