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近期,笔者所在区的初三期末统考卷中的最后一个填空题值得研究,题目如下:如图1,正六边形ABCDEF的边长为4,两个顶点A、B分别在x轴和y轴上运动,则顶点D到原点O的距离的最大值为____,最小值为____.几何中的动点问题是中考热点之一.这类动态问题往往所给条件少,但是考查的知识面却比较广,学生往往不善于解决此类问题.主要原因是思维过于局限,没有归纳掌握此类问题的一般方法,抓不住关键所在.为帮助大家更好地掌握此类问题的解决方法,下面对上述题目作深刻剖析,追本溯源探求本质.提高能力.
Recently, the authors of the final stage of the third exam essay in the area of the last fill-in questions worthy of study, the title is as follows: Figure 1, regular hexagon ABCDEF side length of 4, two vertices A, B respectively in the x-axis and y-axis On the movement, then the vertex D to the origin O distance maximum ____, the minimum value is ____. Geometry of the moving point problem is one of the hot test. Such dynamic problems tend to give less conditions, but the test knowledge However, the students are often not good at solving such problems, mainly because they are too limited in thinking and can not grasp the general method of grasping such problems and can not handle the key issues. To help you better understand the solutions to such problems The following is a deep analysis of the above topics, trace the source to explore the essence.