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圆锥曲线有两种定义,第一定义体现了“质”的区别.第二定义体现了“形”的统一.它们的统一定义体现了三种曲线的共同性质.可以证明两种定义是等价的,这两个定义在解题中有着极其广泛的应用.
There are two definitions of conic curves, the first definition embodies the difference of “quality”. The second definition reflects the unity of “shape”. Their unified definitions reflect the common properties of the three curves. Definitions are equivalent, and these two definitions have extremely wide application in problem solving.