Točno
Dec. 20, 2024, 10:09 p.m. (4 months)

Find the maximal value of S = \sqrt[3]{\frac{a}{b+7}} + \sqrt[3]{\frac{b}{c+7}} + \sqrt[3]{\frac{c}{d+7}} + \sqrt[3]{\frac{d}{a+7}},where a, b, c, d are nonnegative real numbers which satisfy a+b+c+d = 100.

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