优美的板书有利于学生对数学知识的理解和记忆,同时也有利于培养学生的思维能力.如果在板书中能恰到好处地运用“箭号”,更能突出教学的重、难点和关键;能沟通知识的相互联系,区分它们的不同之处;有助于归纳、总结、揭示知识的内在联系,促使学生形成完整的知识结构和认知结构;能引起学生注意,启迪学生思维,寻求解题的思路等、现分类举例说明. The beautiful blackboard helps students understand and remember maths knowledge as well as cultivate students' thinking ability.If you can just use the “arrow” in the blackboard, it can give prominence to the heavy, difficult and critical teaching. It is helpful for inducing, summarizing and revealing the internal connection of knowledge and forcing students to form a complete knowledge structure and cognitive structure. It can arouse students 'attention, enlighten students' thinking and seek solution to problems Ideas, etc., are examples of classification.