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边际收益 R'(t) = 100 单位货币/天,边际成本 C'(t) = 50 + 5t 单位货币/天。计算最大累积净利润以及成本超过收益的第几天。
边际收益 R'(t) = 100 单位货币/天,边际成本 C'(t) = 50 + 5t 单位货币/天。计算最大累积净利润以及成本超过收益的第几天。
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