题目190:最大化一个带权乘积
Maximising a weighted productLet Sm = (x1, x2, ... , xm) be the m-tuple of positive real numbers with x1 + x2 + ... + xm = m for which Pm = x1 * x22 * ... * xmm is maximised.
For example, it can be verified that 10] = 4112 ([ ] is the integer part function).
Find Σm] for 2 ≤ m ≤ 15.
题目:
定义 Sm = (x1, x2, ... , xm) 为正实数的 m 元组,其中 x1 + x2 + ... + xm = m,且 Pm = x1 * x22 * ... * xmm 还要最大化。
比如,可以证明, 10] = 4112 ([ ] 表示对数字取整数部分)。
请给出 2 ≤ m ≤ 15 的 Σm]。
本帖最后由 guosl 于 2020-5-18 09:10 编辑
应用拉格朗日乘数法来求极值即可。
答案:371048281 https://imgsa.baidu.com/forum/w%3D580/sign=19151914249759ee4a5060c382fa434e/284b44a98226cffc0ff8c2abbb014a90f703eae3.jpg
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