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在最近几年的高考数学试题中,经常出现与圆锥曲线在一条直线上的两个焦半径的四则运算(其中典型情况是积与商)密切相关的试题.这类问题若从极坐标的角度出发,很多结果还是容易理解的,但对于没学过极坐标的同学而言,就要绕很大的弯路,甚至难以求出最后结果.本文针对圆锥曲线的一般情形,从定义出发,得出几个通用公式,再与用极坐标法求出的结果对照(二者结果一致),最后应用这些结论解决几个相
In recent years, college entrance examination math test questions, often with the conic curve in a straight line two focal radius of the four arithmetic (which is typically the case of product and quotient) test questions such problems from the polar point of view Starting, many results are still easy to understand, but for students who have not learned polar coordinates, it is necessary to make a great detour, or even difficult to find the final result.This paper for the general case of conic curves, starting from the definition of Several common formulas, and then with the polar coordinate method to find the results of the control (both the results of the same), the final application of these conclusions to solve several phases