1　重点、难点分析圆锥曲线的标准方程及其性质的研究与应用是本章的重点 .由曲线求方程 ,在列式和讨论时 ,要综合运用代数、几何、三角知识 ,有时还要经过较复杂的运算 ,因此 ,它是本章的一个难点 .解决直线与圆锥曲线位置关系的问题以及伴随而来的直线被圆锥曲线截得的弦长、 1 Key and Difficult Issues The research and application of the standard equations and properties of conic sections is the focus of this chapter. From equations to equations, algebra, geometry, and trigonometry, and sometimes even more complicated, are required for formulae and discussions. The operation, therefore, it is a difficult point in this chapter. Solve the problem of the relationship between the position of the straight line and the conic curve and the accompanying chord length of the straight line intercepted by the conic curve.