.expo whiteboard cleaner.The famous mathematics educator Polya once pointed out that "Mathematics has two aspects. On the one hand, it is the rigorous science of Euclidean style. From this aspect, mathematics is like a system of deductive science; but on the other hand, in creation In the process, mathematics is more like an experimental inductive science. "Human thinking is that image thinking is ahead and abstract thinking is behind. Especially for middle and lower grade students, students are interested in some intuitive things. This requires our teachers to use pictures and objects in teaching as much as possible, and combines motion and static. Through the vivid and interesting pictures, the static knowledge can be dynamicized, and the abstract concepts can be visualized to effectively grasp the knowledge. For example, when explaining the section "Viewing Objects from Different Directions", students are not easy to imagine the three views of the cone and the cylinder. Observing the real thing is difficult to demonstrate different perspectives in front of the whole class. Using the intelligent drawing tools in the electronic whiteboard to pull out different geometric figures and let the students observe the dynamics, all the students can experience different visual effects, which are both visual and intuitive, and left a deep impression on the students. . It is even more important to use the intelligent drawing tools in the electronic whiteboard in the teaching of compulsory two-dimensional geometry.