题型一:直线与圆锥曲线的位置关系直线与圆锥曲线的位置关系主要有三种题型:一是判断已知直线与已知曲线的位置关系;二是根据直线与圆锥曲线的位置关系,求直线或曲线方程的参数问题;三是求直线与圆锥曲线相交时所得弦长、弦的中点及轨迹问题等.解答此类题型的一般方法是化为二次方程, Problem 1: The relationship between the position of the straight line and the conic The relationship between the straight line and the conic There are three main types of questions: First, to determine the known relationship between the known curve and the position of the curve; Second, according to the relationship between the straight line and the conic curve, seeking Line or curve equation parameter problems; the third is to find the intersection of straight line and conic curve obtained chord length, the mid-point of the string and trajectory problems, etc. The general method to answer such questions is to turn into a quadratic equation,