Comment 1: The key points and difficulties in teaching are outstanding and the blackboard writing is clear. Teachers have solid basic skills, accurate knowledge explanation, reasonable teaching design, and always take students as the main body. Teachers teach naturally and in a friendly tone, so that students can learn in a harmonious classroom atmosphere and so on.

Comment 2: The blackboard writing is neat and tidy, giving people a kind and kind feeling. At the same time, in the classroom, students can understand that mathematics is closely related to life and be curious about mathematics, so that the classroom effect will be good, the teacher's questions will be in place, and the guidance for students when they have questions will be in place.

Comment 3: The works are highly enthusiastic, explaining the details, taking into account the needs of students at different levels, and adjusting the blackboard writing, speed and teaching methods according to the students' response and the teacher's guidance to strive for the best interests of students. The blackboard writing class is well controlled, freely retractable, excellent and stable. When you find a problem, you can take the initiative to discuss it and naturally reveal excellent learning and knowledge.

Comment 4: The teaching objectives of this course are clear and specific, easy to stimulate interest, guide independent inquiry, cooperation and exchange, exercise design reflects the comprehensive application of knowledge, with various forms, moderate degree of difficulty and proper guidance of learning methods. This is a very good class.

Comment 5: the teaching of this course focuses on accurately grasping the difficulties, making the teaching content clear and grasping the key points; The three dimensions of reasonable structure, close connection with nature and emotional attitude and values meet the teaching requirements, the characteristics of teaching materials and the reality of students. This is a mature course.

Expanding knowledge-blackboard writing

From a dynamic point of view, writing on the blackboard is a verbal activity in which teachers write words and symbols on the blackboard in class to convey teaching information and educate people. Also called teaching written language.

From a static point of view, blackboard writing is the general name of teaching information presented by teachers with concise words, symbols and charts in order to help students understand and master knowledge in the teaching process.

The function of blackboard writing is conducive to imparting knowledge, developing students' intelligence and ability, cultivating students' sentiment, activating classroom atmosphere and memorizing knowledge.