高考中填空题的最后一题,一般具有较好的区分度,充分考查考生的数学能力,因而考生是比较畏惧的.如何找到其切入点,才能将问题解决呢?下面举例说明:题目(2015年高考新课标Ⅰ卷理科第16题)在平面四边形ABCD中∠A=∠B=∠C=75°,BC=2,则AB的取值范围是切入点1从函数的角度思考,构造函数模型,将问题转化为求值域问题. The final question in the college entrance examination fill in the blank, generally has a better degree of distinction, fully examine the candidate’s math ability, so candidates are more daunting .How to find its entry point, to solve the problem? Here’s an example: the subject (2015 Year college entrance examination new curricula Ⅰ Volume Sciences Section 16) ABCD quadrilateral ABCD ∠ A = ∠ B = ∠ C = 75 °, BC = 2, then the range of AB is the starting point 1 from a functional point of view, the structure Function model, the problem is converted to the domain of the problem.