当一个物体的运动过程是由N个(N很大)分过程组成时,命题人往往会对这“N”设置“陷阱”.解题者一旦掉进这个“陷阱”,就很难做出正确解答,所以解题者只有设法绕过这个“陷阱”,才能“柳暗花明”.下面来看两个例子.例1.速度都是90km/h的甲、乙两列火车在同一水平路面上相向而行, When an object’s movement process is composed of N (N-large) sub-processes, the propositionor will often set a “trap” for this “N”. Once the solver falls into this “trap”, it is difficult to make Answer correctly, so the solver only managed to get around this “trap” before he could “look.” Let’s look at two examples. Example 1. Two trains A and B with a speed of 90km/h are facing each other on the same level And OK,