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本文对几个错例作出辨析1人民教育出版社出版的高中数学教材第二册(上)中P106的例3,题目如下:一炮弹在某处爆炸,在A处听到爆炸声的时间比在B处晚2s.(1)爆炸点应在什么样的曲线上?(2)已知A,B两地相距800m,并且此时声速为340m/s,求曲线的方程.对于第(1)小题,教材上是这样解的:由?
In this paper, we make several examples of the analysis of the 1 case of P106 in the second edition (top) of the high school mathematics textbook published by the People’s Education Press. The title is as follows: A cannonball explodes somewhere, and the time of hearing an explosion sound at A is more than At B, it is 2s later. (1) What kind of curve should the explosion point be? (2) It is known that A and B are 800m apart and the speed of sound is 340m/s. Find the equation of the curve. For (1) ) The subtitles, the textbook is such a solution: by?