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动点问题是初中数学的一个难点,也一直是中考的热点.“双动点型线段的最小值”问题是指:目标线段的两个端点都是动点,在变化的同时相互又有内在关系,要求这类线段长度的最小值.由于在这类问题中,目标线段的两个端点都是变化的,很多学生会觉得难以把握而无从下手,甚至望题生畏.那么求解这类问题的关键是什么呢?
The problem of moving point is a difficult problem in junior high school mathematics and it has also been a hot spot in senior high school entrance examinations. “The minimum value of double moving point type line” means that both ends of the target line segment are moving points, There is an internal relationship that requires the minimum length of such a line segment.Because in this type of problem, both endpoints of the target line segment are changing, many students find it difficult to grasp and can not start, or even daunting. What is the crux of the problem?