草图,是指大致符合题目所涉及的函数图象.画草图要注意准确反映函数的奇偶性、单调性、最值、特征点(线)、周期性等特征,所以画草图是一种探索问题的过程.首先说明一下,在做解答题时,草图代替不了解答过程,但是可以为解答快速找到正确的方向,为顺利解答提供强有力地帮助.所以解题时要养成画图的习惯,善于数形结合,往往对解题效率的提升十分奏效.导数在高中数学解题中是一种有力的工具.在近年来的各地高考中常以压轴题出现, Sketching refers to the image of a function that is roughly in line with the topic. Drawing sketches should pay attention to accurately reflect features such as parity, monotonicity, value, feature points (lines), periodicity, etc. Therefore, sketching is an exploration problem The first to explain that in doing answer questions, the sketch can not replace the answer process, but can quickly find the correct direction for the solution, to provide a strong solution to help answer.So the problem should develop the habit of drawing, good at Combination of several forms, often to enhance the efficiency of problem solving is very effective.Degree in high school mathematics problem solving is a powerful tool.In recent years, the college entrance examination often appear to pressure axis problem,