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成本函数： C(q) = 500 + 50q + 0,1q^2 （雷亚尔）。计算边际成本 C'(q) 并在处评估。
成本函数： C(q) = 500 + 50q + 0,1q^2 （雷亚尔）。计算边际成本 C'(q) 并在处评估。
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