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1.本单元重、难点分析本单元的重点:直线的方程,两条直线的位置关系,曲线和方程,圆的标准方程和一般方程,直线与圆、圆与圆的位置关系及判定方法,判断二元二次方程为圆的条件.本单元的难点:直线的斜率与它的倾斜角之间的关系,根据斜率判定两条直线的位置关系,点到直线的距离公式的推导,直线与圆、圆与圆的位置关系的判定.本单元的高考热点是:直线方程的几种形式,两点间的距离公式,点到直线的距离公式,确定圆
1. The unit is heavy, difficult to analyze the focus of this unit: the equation of the straight line, the relationship between the two straight lines, curves and equations, standard equations and general equations of the circle, the relationship between the line and the circle, the circle and the circle and determine the method, Determine the condition of the second quadratic equation is round.The difficulty of this unit: the relationship between the slope of the straight line and its tilt angle, according to the slope to determine the relationship between two straight lines, point to the straight line distance formula derivation, straight line and Round, round and round the location of the relationship between the hot spot entrance examination unit is: several forms of linear equations, the distance between two points formula, the distance from the point of the formula to determine the circle