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行高中数学新教材试验本第二册（上）的第１３０页，有这样一道例题：“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．”课本上对第一问的解...
On the 130th page of Test Book 2 (top) of the new mathematics textbook for high schools, there is such an example: "A bomb exploded somewhere. The time of hearing an explosion at A was 2 seconds later than at B. (1) What kind of curve should the explosion point be?(2) It is known that A and B are 800m away from each other, and the speed of sound is 340m/s at this time, and the equation of the curve is to be found.” The solution to the first question in the textbook...