考查方向一:函数作图与识图函数作图要注意函数的定义域,同时要化简函数的解析式,充分利用函数的定义域、值域、极值、单调性、奇偶性、对称性、周期性来描点或变换作图.对于函数识图题,考生要从图像的左右、上下范围,端点、特殊点情况,以及图像反映出的函数性质等方面进行观察分析,然后结合题设给出的条件作出判断. Examining the direction of a: Function mapping and knowledge map Function mapping should pay attention to the function of the domain, at the same time to simplify the analytic function, make full use of the function of the domain, range, extreme value, monotonicity, parity, symmetry , Periodically to plot points or transform for the graph.For the function knowledge diagram, candidates from the image of the left and right, up and down range, the end point, the special point of the situation, as well as the image reflects the function of the nature of observation and analysis, and then combined with the title Out of the conditions to make judgments.