The chapter of multiplication and division of algebraic expressions tells the power of rational number operation in grade seven, and the algorithm of rational number multiplication is closely related to the content of algebra, which is the expansion and continuation of these two chapters. Power multiplication is the content of the second section of this chapter, and it is another operation after power multiplication with the same base. Starting with the corresponding operation of numbers, the analogy is transformed into the operation of formulas, and the operation rules of formulas are explored and summarized, so that the new operation rules are naturally assimilated into the original knowledge and the original knowledge is expanded and developed. Here, we use the knowledge of power with the same base to explore and discover the law of power, which is the basis for the next step of exploring new laws, and the learning level is constantly improving.
1, learning situation analysis
(1) said he had knowledge and experience.
Students; Is to learn the power of the screen on the basis of the same number power multiplication. Therefore, when teaching this lesson, we should make full use of this knowledge and experience to create teaching situations.
(2) when it comes to learning methods and skills.
Independent inquiry and cooperative communication are important ways to learn this lesson well. In teaching, make full use of the corresponding operation of specific numbers, and then get a sample letter. Through observation, analogy and independent exploration of the law, through the process of cooperative communication and group discussion, students' cooperative ability and logical thinking ability are cultivated.
(3) Personality development and group progress
Everything is for the development of students. Teachers are required to make every student develop by leaps and bounds on the original basis through scientific education and teaching methods. Therefore, in the process of learning, I pay special attention to those students who are weak in courage and ability, encourage them to be bold, diligent in thinking and dare to question, and let them actively participate in the whole exploration activity; For those students who usually have strong hands-on ability, they are required to learn to cooperate and communicate, develop a scientific attitude of contending for innovation in cooperative exploration, and let all kinds of students gain, improve and develop.
2. The textbook focuses on the difficulties.
Emphasis: the derivation and application of power.
Difficulty: distinguish the difference between exponential operation and multiplication with the same base.
3. Teaching objectives
The new curriculum standard requires that the fundamental goal is to cultivate students' ability and interest. According to the age characteristics of students and the analysis of teaching materials, the following teaching goals are established: knowledge and skills goals.
(1) has experienced the process of exploring power law through observation, induction, conjecture and proof.
(2) Master the power law.
(3) will use the law to do related calculations.
4, process and method objectives
(1) Cultivate students' abilities of observation and inquiry, cooperation and communication, problem-solving and learning reflection.
(2) Experiencing the transformation of mathematical thought from concrete to abstract and then to concrete. 3. Emotions, attitudes and values
Experience the fun of solving problems with mathematical knowledge and cultivate students' love for mathematics. Let the students experience the joy of success through the teacher's timely praise and drumming.
5. Teaching methods and learning methods
Teaching method: In view of the fact that junior two students have certain mathematical activity ability and experience abstract logic ability, guided by student-oriented thinking, the guiding inquiry method is mainly adopted. Let students think independently first, then communicate their findings with their peers, and then sum up the law in the process, gain new understanding and experience the exploration process of the law.
Learning style: self-exploration, cooperation and exchange of seminar-based learning, aimed at allowing students to experience the process in the process of exploration, actively build knowledge, and cultivate students' speaking ability, practical ability and thinking ability.
Teaching means: Multimedia-assisted teaching.
6, teaching material processing
(1) Find the area of a square desktop with a side length of 8 1cm, that is, 34cm, which leads to questions and makes students feel the power of the screen.
Operation also comes from the needs of life, thus stimulating students' thirst for knowledge.
(2) In order to make students better understand the differences and applications of the two operations, Example 2 and error correction are specially added.
(3) After acquiring new knowledge, design an inquiry activity based on the intellectual toy Rubik's Cube that students are familiar with and love, so that students can experience the natural application of power again.
7. It is difficult to add an extreme challenge to the homework and solve it through the inverse operation of the screen power operation. Not only can students have enough thinking space, but also some students with strong academic ability can get higher development and cultivate students' innovative thinking.