初中《几何》第二册P_(76)在证明基本轨迹6时,将整个轨迹分成(?)与(?)属两部分加以证明,这样容易给学生以错觉,认为上面和下面是两个轨迹,造成以部分图形充当轨迹的错误:此外,在②的证明巾叙述不够清楚,对直线AB上的点也没有讨论,还使用了学生尚不熟练的逆否命题的证明代替原命题的证明,增加了学习中的困难。 In the junior high school Geometry Book II P_(76), when the basic trajectory 6 is proved, the entire trajectory is divided into two parts, the (?) and the (?), so that it is easy to give the students the illusion that the top and bottom are two trajectories. , resulting in the mistake of using some of the graphs as trajectories: In addition, the narrative descriptions in 2 are not clear enough, there is no discussion of the points on the straight line AB, and the proof of the unproficient reversed proposition is used instead of the proof of the original proposition. Increased learning difficulties.