With variable substitution,several kinds of linear differential equations are solved and several sufficient and necessary conditions are obtained.
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In this paper, the two-product inventory model with variable substitution price is studied in the retailer's view.
从销售商的角度出发，研究了可变替代价格下的两产品库存问题。
With variable substitution, several kinds of linear differential equations are solved and several sufficient and necessary conditions are obtained.
借助于变量代换，求解几类线性微分方程，并得到了几个求解的充分必要条件。
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