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证明:如果 a, b > 0 且 a + b = c (常数),则当 a = b = c/2 时, 最小。使用二次函数技巧。
证明:如果 a, b > 0 且 a + b = c (常数),则当 a = b = c/2 时, 最小。使用二次函数技巧。
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