2019高考数学二轮复习专题五解析几何第一讲小题考法——直线与圆课件理.ppt

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解析几何,专题五,攻重点 高考考什么,怎么考2讲破小题,2讲攻大题,扫盲点 何处易失分,欠缺什么能力5层面优化提升,考点(一),直线的方程,考点(二),圆 的 方 程,几何法,待定系数法,在求圆的方程过程中,常利用圆的一些性质或定理直接求出圆心和半径,进而可写出标准方程常用的几何性质有: 圆心在过切点且与切线垂直的直线上; 圆心在任一弦的中垂线上; 两圆内切或外切时,切点与两圆圆心在一条直线上,根据题意,选择方程形式(标准方程或一般方程); 根据条件列出关于a,b,r或D、E、F的方程组; 解出a,b,r或D、E、F,代入所选的方程中即可,考点(三) 直线与圆的位置关系,必备知能自主补缺,Thank You!,

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