1, Advantages: clear teaching design ideas, knowledge from shallow to deep: inculcate, create scenarios: stimulate students' thinking, promote teacher-student interaction, and activate classroom atmosphere; Guide students to summarize, reflect the teacher's leading role and students' dominant position, cultivate students' ability to analyze examples and solve problems, and better reflect the "three-dimensional goal" of the new curriculum.

Disadvantages: insufficient details in class; It is not enough to drive students; The class atmosphere is not very active, and the students are not excited, so they can't leave class.

Suggestions: students can be given more time to discuss and control the teaching rhythm appropriately; Creating examples can increase some difficulties and better train students' thinking; Many factors should be considered in preparing lessons, and classes should be flexible (students can discuss cases).

2. Advantages: The teaching process is clear and always focuses on the teaching objectives. Grasp the key points and highlight the difficulties. Teachers can guide students to observe, calculate, compare, guess, reason, communicate and other activities, so that students can effectively experience the formation process of mathematical knowledge. Teachers can guide students to practice independently, explore cooperation and exchange according to specific teaching contents.

Disadvantages: in classroom teaching, the teacher did not set a scene suitable for students to learn, which led to incoherent teaching process; Teachers demonstrate less, and students have no chance to show; The teacher didn't help the students solve the safety problems in practice in time.

Suggestion: Pay attention to the students' main role. Ask questions to give students the necessary time to think, and set questions scientifically. We advocate simplifying complex problems, concretizing abstract problems, and giving necessary inspiration when students' thinking is blocked.

3. Advantages: The instructor has clear thinking, fluent language, reasonable arrangement and good effect. My feeling is that I am good at arousing students' enthusiasm by fully explaining the text and highlighting the key points. Handle the relationship between intelligence training and emotional education, and pay attention to the implementation of all-round quality.

Disadvantages: in the content arrangement of this class, it is best to reduce the activity content of one class, otherwise the teaching time is a bit tight; Students should be taught how to deal with data easily and how to find conclusions (rules) from data.

Suggestion: Increase classroom capacity and strengthen thinking training. Quality should also be quantity. Classroom efficiency is not only "quality" but also "quantity", that is, classroom capacity. In class, we must set questions scientifically and reasonably according to high requirements, increase the intensity of training, and let students use their brains, mouths and pens as much as possible.