直线与圆锥曲线的位置关系类高考试题,基本与一元二次函数及韦达定理形影不离,这样就使得问题解决具有模式化.笔者时常在思考,能否回避韦达定理呢?在复习二次函数形式时,二次函数的零点式f(x)=a(x-x1)(x-x_2)(a≠0,x_1,x_2为函数y=f(x)与x轴交点的横坐标,亦是方程f(x)=0的两个实数根)给笔者以启发.以下就是笔者运用零点 The relationship between the position of the line and the conic class class test questions, the basic and one dollar quadratic function and the Vedic theorem inseparable, so that makes the problem is solved with the pattern. I often think, can evade the Veda theorem? In reviewing the quadratic function Form, the zero point of the quadratic function f (x) = a (x-x1) (x-x2) (a ≠ 0, x_1, x_2 is the abscissa of the intersection of the y-function y = f Is the equation f (x) = 0 two real roots) to the author to inspire the following is the author of the use of zero