2019年中考数学总复习第三单元函数第12课时一次函数的应用课件湘教版201901151143.pptx

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UNIT THREE,第三单元 函数及其图象,第 12 课时 一次函数的应用,考点一 一次函数与方程(组)、不等式的关系,考点聚焦,图12-2,图12-3,考点二 一次函数的应用,对点演练,题组一 教材题,图12-4,D,-3,题组二 易错题,【失分点】 忽视自变量的取值范围;忽视分情况讨论.,图12-8,方法模型(1)从函数图象角度求一元一次不等式的解集,就是确定直线满足一定位置关系的所有的点的横坐标. (2)从函数图象角度求二元一次方程组的解,就是求两直线的交点坐标.,探究二 建立一次函数模型解决方案、最值问题,【命题角度】 (1)运用一次函数性质求最大值或最小值; (2)运用一次函数有关性质解决方案问题.,针对训练,探究三 函数图象类实际问题,【命题角度】 (1)单一直线类实际问题; (2)分段函数类实际问题; (3)直线相交类实际问题.,图12-9,4000,100,图12-9,图12-9,针对训练,图12-10,图12-10,

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