【摘要】 建立了企业的产出量、创新投入量和广告费用投入量之间的数学模型，并讨论了该数学模型解的存在性更多还原

【Abstract】 A mathematical model for total product and innovatory expenditures and advertising expenditures of an enterprise is established,and the existence of the model’s solution is discussed.更多还原