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在常规试题中添加一些干扰因素,使题目的条件产生相对差异,是增加试题难度的常用方法。能否处理好题目中的干扰因素是解题成败的重要一环。下面通过例题谈谈这个问题。1 排除干扰 例1 已知A、B两地相距100米,甲带一只狗从A地向前行,甲的速度为2米/秒,狗的速度为6米/秒,同时,乙以3米/秒的速度从B地与甲相向而行,当狗遇乙后便回头跑,当与甲相遇后又回头跑,这样继续下去。求甲乙两人相遇时狗跑过的路程。
Adding some interference factors in the routine test questions to create relative differences in the conditions of the questions is a common method to increase the difficulty of the questions. The ability to deal with the interference factors in a good question is an important part of solving problems. The following example addresses this issue. 1 Exclusion of interference Example 1 It is known that A and B are 100 meters away from each other. A dog is carrying a dog from A to the front. The speed of A is 2 meters per second, and the speed of the dog is 6 meters per second. The speed of 3m/s goes from B to A. When the dog meets B, it runs back and when it meets A, it runs back and continues. Ask for the distance the dogs run when they meet.