Convex function of demand, convex distribution of price and an optimal model for coexistence of multi-prices are established.
建立了商品销售中的凸需求函数，凸分布和多种价格并存的优化模型。
Second, a convex distribution model for the price is proposed. The formulae are given respectively for the expectation price, the variance of the price and the income.
其次，提出了价格的凸分布模型，并给出了期望价格，价格的方差和期望收益的计算公式。
The calculation results show that the pressure distribution shape is a convex parabola and the increase of the radial taper of the seal face can decrease the friction coefficient.
计算结果表明，机械密封端面压力分布呈凸抛物线状，增加密封端面锥度可降低摩擦系数。
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