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近年来中考中,出现了一类要求我们判断是否存在一个时间,使某条动态线段分一个图形面积为两个特定部分的问题.解答这类问题,除了考虑化“动”为“静”的策略外,还要注意从这两个特定部分的面积关系入手,想方设法构造与运动时间t有关的方程.若方程有解且这个解符合题意,就存在;否则,就不存在.例1(贵州省六盘水市)如图1-1,已知△ABC中,
In the middle school entrance examination in recent years, there appeared a class of questions that asked us to judge whether there existed a time and divided a dynamic line segment into two specific parts. In answering this kind of question, we should consider “moving” as “ Static ”, but also pay attention to the area relationship between the two specific parts of the start, trying to construct the equation with the movement time t.If the equation is solved and the solution to the problem, there; Otherwise, there is no Example 1 (Liupanshui City, Guizhou Province) As shown in Figure 1-1, △ ABC is known,