求动点隐性路径长的问题在近年的中考卷中屡屡出现,如2012年张家界卷第16题、2012年福州卷第21题等,今年又出现两例.由于此类问题本身对初中生的思维能力要求较高,同时又和高中解析几何中的“轨迹”知识存在一定的衔接关系,所以受到命题者的青睐.学生在解此类问题时常常由于摸不清的运动路径是什么而无从下手.笔者以今年的两道中考题为例,谈一谈解题思路.例1(2013年湖州卷第16题)如图1,已知点A是第一象限内横坐标为2槡3的一个定点,AC⊥x轴于点M,交 The problem of long route to implicit paths has appeared frequently in recent years, such as the 16th Zhangjiajie Volume in 2012 and the 21th Fuzhou Volume in 2012. There are two more such cases this year, Thinking ability of higher demanding, at the same time and high school analytic geometry “trajectory ” knowledge there is a certain convergence relationship, it is favored by the proponents.Understanding students in such problems often due to ambiguous movement path is Example 1 (2013 Huzhou Volume 16 questions) as shown in Figure 1, the known point A is the first quadrant of the horizontal axis 2一 3 a fixed point, AC ⊥ x axis at point M, AC