著名数学家华罗庚先生说过“形缺数时难入微,数缺形时少直观。”就是说,几何直观是揭示数学本质的有力工具,利用图形描述几何或其他数学问题,既可为所需解决的问题提供思路,同时也可预测结果。现行教学中,不少教师画图时随意性大,片面夸大“形”的作用,试图直接从所画图形中找到答案或是寻找解题捷径,放弃对数学本质的探究,缺乏深层思考, Mr. Huaguogeng, a famous mathematician, said that when the number of missing forms is hard to find, the number of missing shapes is less intuitive. “That is to say, geometric intuition is a powerful tool for revealing the essence of mathematics, and the use of graphics to describe geometric or other mathematical problems can be either The problems to be solved provide ideas as well as predictable results. In the current teaching, many teachers draw the role of randomness and one-sided exaggeration ”shape ", try to find the answer directly from the drawing or find shortcut to solve the problem, give up the exploration of the nature of mathematics, lack of deep thinking,