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实验教材《数学》第二册(上)§8.1中给出了椭圆的基本定义(俗称第一定义),其数学表达形式描述为|MF1|+|MF2|=2a(2a>|F1F2|) §8.2中例4给出的轨迹是椭圆,并且概括出的是统一定义(也称第二定义),其数学表达形式描述为
The basic definition of the ellipse (commonly referred to as the first definition) is given in § 8.1 of the experimental textbook “Mathematics” in Volume 2 (above). Its mathematical expression is described as |MF1|+|MF2|=2a(2a>|F1F2|) The trajectory given in Example 4 in § 8.2 is an ellipse, and the general definition (also called the second definition) is generalized. The mathematical expression is described as