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直线与圆锥曲线相交于A、B两点,求弦A B之长,是中学解析几何中的常见题,常利用两点距离公式得解。本文纵观课本及参考资料巾出现的各种题型，归纳整理出六种特殊求法并辅以典型范例说明，以飨读者.
The intersection of the straight line and the conic curve in two points A and B. Finding the length of the string A B is a common problem in the analytical geometry of middle schools. The two-point distance formula is often used to solve the problem. This article looks at the various types of questions that appear in textbooks and reference materials, and summarizes six special methods and supplements them with typical examples.