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高中解析几何第二章圆锥曲线中讲了椭圆和双曲线的四个常数a、b、c、e,在第四章圆锥曲线的统一极坐标方程中又讲了常数e、p、无形中常给学生造成这样一种错觉:对于椭圆和双曲线。在直角坐标系中有a、b、c,在极坐标系中川e、p,似乎它们之叫没有多大联系。这对于形成完善的认知结构及应用它们来解题,都是不利的。因此,在讲完统一的极坐标方程或讲完方程互化后,建议花点时间补讲这五个常数
In the second chapter of the analytical geometry of high schools, the four constants a, b, c, and e of the ellipse and hyperbola are described in the conic section. In the unified polar coordinate equation of the fourth chapter, the constants e, p, and the invisible Students create such an illusion: for ellipses and hyperbolas. In rectangular coordinates, there are a, b, and c. In the polar coordinate system, e and p seem to have little connection. This is not good for forming a perfect cognitive structure and applying them to solving problems. Therefore, it is advisable to take some time to make up for these five constants after speaking about the uniform polar equations or after the equations are finished.