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1、第三课时第三课时 线性规划线性规划 【学习目标学习目标】 1、 二元一次不等式(组)的几何意义；用平面区域表示二元一次不等式(组)。 2、 会从实际情景中抽象出二元一次不等式(组)表示的平面区域及简单的二元 线性规划问题。 【学习重点学习重点】 解线性规划问题的步骤 【学习难点学习难点】 解线性规划问题的步骤 自主学习自主学习 1. 二元一次不等式表示的平面区域：在平面直角坐标系中，设有直线（B 不为 0）及点，则0CByAx),(00yxP(1)若 B0，则点 P 在直线的上方，此时不等式000CByAx表示直线的上方的区域；0CByAx0CByAx(2)若 B0，则点 P 在直线的下方，此
2、时不等式000CByAx表示直线的下方的区域；0CByAx0CByAx (3) 若 B0，b0）的值是最大值 0, 002063yxyxyx为 12，则的最小值为 23 ab5某企业生产甲、乙两种产品，已知生产每吨甲产品要用 A 原料 3 吨，B 原料 2 吨；生产每 吨乙产品要用 A 原料 1 吨，B 原料 3 吨，销售每吨甲产品可获得利润 5 万元，每吨乙产品可 获得利润 3 万元。该企业在一个生产周期内消耗 A 原料不超过 13 吨，B 原料不超过 18 吨.那 么该企业可获得最大利润是 - 4 - 学后反思学后反思 _ _9JWKffwvG#tYM*Jg&6a*CZ7H$dq8Kqqf
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