《数学课程标准》指出:“学生的数学学习内容有利于学生主动地进行观察、实验、猜测、验证、推理与交流等数学活动。”有效的数学学习活动不能单纯地依赖模仿和记忆。动手操作、自主探究和合作交流是学生学习数学的重要方式。初中数学课堂应创设一种符合学生认知规律的轻松、和谐的学习氛围,应该鼓励学生自主探究和合作交流,并能不断地自我反思, The Mathematics Curriculum Standard states: “Students 'math learning content facilitates students' initiative in mathematical activities such as observation, experiment, guesswork, verification, reasoning and communication.” Effective mathematical learning activities can not rely solely on imitation and memory. Hands-on operation, self-exploration and cooperation and exchange are important ways for students to learn mathematics. Junior high school mathematics classroom should create a relaxed and harmonious atmosphere of learning that conforms to the cognitive rules of students. Students should be encouraged to explore and cooperate with each other independently and reflect themselves constantly.