2018年高中数学第2章圆锥曲线与方程2.1圆锥曲线课件9苏教版选修2_1.ppt

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圆锥曲线中的定点问题,一、夯实基础 提炼方法,将所给方程中的参数分离,转化为利用恒成立思想 解方程组 求两条曲线的交点即为所求定点,二、典例分析,提高能力,题型1:直线过定点题型2:圆过定点,卢茹玉,秦有为,变式,解题回顾,求解直线过定点的方法:,(1)设参数用参数表示动直线方程转化为恒成立问题,(2)特殊位置找出定点,再验证,解题回顾,求解圆过定点的方法:,(1)设参数用参数表示动圆方程转化为恒成立问题,(2)特殊位置找出定点,再验证,变式,化为恒成立问题,由特殊情况找出定点,对一般情形加以证明,三、课堂小结 归纳提升,求解直线过定点的方法:,求解圆过定点的方法:,四、拓展练习 巩固成果,谢谢指导!,

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