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Abstract: With the rapid development of information technology and the constant change of education, multimedia technology has become a very common teaching method in school education activities at this stage. In junior high school mathematics teaching, rational use of multimedia technology and its advantages can make classroom teaching activities shine brilliantly, but at the same time, we should be aware of the possible teaching harm brought by multimedia technology. In this regard, teachers can talk about the teaching application of multimedia technology from two aspects: advantages and disadvantages, combined with the actual teaching experience of junior high school mathematics.

Keywords: junior high school mathematics; Multimedia teaching; Advantages and disadvantages analysis;

Nowadays, under the development trend of Internet+education, the use of multimedia technology, with the help of intuition, image and experience in multimedia, can not only help us to better build an efficient classroom, but also enable us to guide students to learn junior high school mathematics knowledge more effectively. However, due to the budding of multimedia teaching methods, a perfect teaching system has not yet been formed in actual teaching, and a large number of teachers cannot fully tap the promotion value of multimedia teaching. Therefore, in my opinion, in order to better carry out mathematics teaching activities based on multimedia concept, teachers should scientifically clarify the advantages and disadvantages of multimedia teaching methods and reasonably carry out mathematics classroom teaching activities.

First, the advantages of multimedia technology in junior high school mathematics teaching

With the deepening of education reform, it is no longer uncommon to integrate network technology into classroom teaching activities at this stage. In junior high school mathematics teaching, it is a major trend for multimedia to enter the teaching classroom [1]. In order to make our classroom teaching activities more modern, it is not only necessary but also necessary to make rational use of multimedia technology and give full play to its advantages in teaching.

(A) can improve students' interest in learning

The biggest problem we face in junior high school mathematics teaching is that students lack interest in mathematics learning. So why is this problem? I think there are two main reasons: first, mathematics is different from other disciplines, it is rational and rigorous, which will make our subject study too boring; Secondly, in the traditional learning concept, we think that mathematics should be a rigid subject. Even today, with the development of quality education, there are still many teachers who have this wrong impression. In their actual teaching, they will pay more attention to students' practice and understanding. In this teaching method, students are likely to regard learning as a task. At this time, it is extremely difficult to stimulate students' interest in learning.

The application of multimedia technology in practice teaching can solve the above problems well. First of all, the intuitive animation, video, audio and image demonstration functions in multimedia can make abstract mathematical knowledge more intuitive; Secondly, the rational use of multimedia technology to carry out life-oriented and game-oriented junior high school mathematics classroom teaching activities can also reduce the boredom of mathematics knowledge and make the classroom learning atmosphere more relaxed and happy; Finally, the teaching mode that effectively combines the "dynamic" in multimedia technology with the "static" in mathematics textbook knowledge can also enable students to better discover the charm of mathematics learning, thus truly falling in love with mathematics learning.

(B) can improve the quality of classroom teaching.

Mathematics is an extremely important subject, which is not only the basis for students to learn physics, chemistry and other disciplines, but also an indispensable tool in daily life. Junior high school, as a link between the preceding and the following in students' mathematics learning career, plays an important role in actual teaching, but in this stage of mathematics teaching, we will also encounter many problems, such as teachers are not good at teaching and students are unwilling to learn.

In order to solve these problems, before the multimedia-based junior high school mathematics classroom teaching, teachers can use network technology to consult relevant courseware and high-quality teaching videos, and improve the classroom teaching efficiency by adapting ready-made courseware and improving other teachers' excellent teaching methods. At the same time, students can also preview before class by using network technology according to the guidance scheme provided by the teacher, and integrate the problems encountered in the preview and give them to the teacher, and then the teacher will discuss them in class through multimedia courseware display according to the problems raised by the students. With the development of information technology, multimedia teaching is favored by teachers and students [2]. In this multimedia-based junior high school mathematics teaching mode, teachers can alleviate the teaching pressure to a certain extent, and students can get more targeted mathematics learning. Therefore, the actual quality of classroom teaching will be improved.

(3) It can help teachers make teaching breakthroughs.

Over the years, after many generations of teachers' teaching exploration, teaching perfection and teaching accumulation, our junior high school mathematics classroom teaching has a relatively complete teaching model, which is both a good thing and a bad thing for all mathematics teachers. The advantage is that our teaching can be traced back, and the disadvantage is that this teaching mode can easily make our teachers rely on teaching and thus stand still.

Under the new educational concept, a series of changes have taken place in our classroom teaching mode, which just provides conditions for teachers' teaching breakthrough. In actual teaching, using new teaching methods such as multimedia technology to organize teaching activities can make classroom teaching more novel and vivid; Multimedia teaching methods that have not yet formed a complete system will also improve teachers' teaching skills through continuous exploration and improvement; At the same time, the perfection and emergence of multimedia technology requires teachers' active learning, which follows the educational concept of lifelong learning in teachers' development and enables teachers to effectively cultivate their learning ability to some extent. Therefore, multimedia teaching methods also have certain advantages in improving teachers' teaching skills and helping teachers make teaching breakthroughs.

(D) can create a novel teaching situation.

Junior high school students have a certain rebellious mood in their study, and the wrong idea of "learning is useless" often appears in actual study. In junior high school mathematics learning, if students don't pay enough attention to classroom teaching knowledge, they are likely to get bored. Based on this, in the classroom teaching of junior high school mathematics, we can use multimedia technology to make students realize the important role of mathematics in life by creating life scenes, thus attracting students' attention to mathematics learning. When students have a certain desire to participate in teaching and attach importance to psychology, it is much easier to cultivate students' mathematical knowledge.

In addition, in junior high school mathematics teaching, due to the influence of students' learning experience, existing knowledge, learning thinking and other factors, their classroom learning often has problems such as poor understanding and inability to establish intuitive imagination thinking. Based on this, in the practical teaching of junior high school mathematics, multimedia technology can be used to create learning situations, such as virtual graphics conversion and function image construction. In order to change the situation that students used to rely solely on imagination to solve math problems, and let students really get the simplest and most direct math learning.

Second, the lack of multimedia technology in junior high school mathematics teaching

In junior high school mathematics classroom teaching, using multimedia technology can not only visualize the abstract knowledge in textbooks, but also effectively stimulate students' desire to participate in mathematics classroom. But at the same time, we should also realize that the application of multimedia in junior high school mathematics classroom teaching is a double-edged sword [3]. Rational use of multimedia technology will certainly help to improve the quality of teaching and stimulate students' interest in learning, but if we can't use multimedia technology correctly and make multimedia teaching methods a mere formality, it will also bring many problems to our teaching activities.

(A) inappropriate multimedia activities can not help students learn mathematics

In the multimedia classroom teaching of junior middle school mathematics, multimedia technology should not be used throughout the teaching process, but should seize the opportunity. However, in actual teaching, many teachers are too eager to pursue the overall teaching effect of multimedia teaching. When they use multimedia technology to organize teaching activities, they often use multimedia in the whole class. In this teaching mode, teachers just show courseware and become "projectionists" in the classroom, which will make our multimedia teaching activities become a mere formality. At the same time, this unchangeable method of teaching knowledge according to courseware can easily make students feel tired of learning.

In addition, there is a lot of knowledge in our junior high school mathematics learning that is not suitable to be explained simply by multimedia technology, such as solving problems. Need the teacher to demonstrate on the blackboard. Therefore, if teachers don't realize the auxiliary position of multimedia in actual classroom teaching and regard it as the main teaching tool, it is easy to make mathematics lessons into courseware demonstration classes, and it is difficult for students to learn mathematics knowledge and skills from them.

(B) obsolete multimedia courseware easily affects the efficiency of classroom teaching.

In order to reduce the time of preparing lessons, we often use some network courseware in multimedia teaching at this stage. There must be many excellent places in these courseware, but these courseware may not be suitable for our students. The fundamental purpose of education is to realize the development of human personality [4]. Therefore, in junior high school mathematics teaching, students are the main body of learning, and they have their own foundation, habits and methods. In actual teaching, using the same courseware to cram students into mathematics classroom teaching activities not only violates the requirements of quality education concept, but also affects the actual teaching quality.

In addition, with the reform of education, there are many new contents in junior high school mathematics teaching at this stage. There is a certain conflict between the innovative mathematics classroom and the outdated multimedia courseware. In actual teaching, it is difficult to realize targeted modern teaching if teachers always continue the previous courseware. In this teaching method, students can not only discover the great charm in mathematics, but also feel disgusted and think that the teacher's teaching is just coping and making do. In this case, it is difficult to improve the efficiency of classroom teaching.

(C) Teachers and students easily rely on multimedia technology.

Undeniably, the application of multimedia courseware in teaching has brought a new direction to our teaching activities. In junior high school mathematics teaching, it makes our classroom teaching more interesting and intuitive, but at the same time, its dependence can not be ignored.

First of all, in the aspect of teachers' teaching, teachers gradually get used to the method of organizing teaching activities with the help of multimedia technology, and find the application advantages of multimedia in teaching. At the same time, many teachers are slowly discovering the quick effect of using multimedia technology, that is, under the multimedia courseware, the process of preparing lessons that we used to spend more time is greatly reduced. At this time, some teachers will have a certain psychological dependence on teaching and become more and more keen on using multimedia technology to carry out teaching activities. As we all know, multimedia is just a teaching tool. If we rely too much on this tool, it is easy to put the cart before the horse.

Secondly, in terms of students' learning, it is true that colorful and interesting factors in multimedia can easily stimulate students' interest in learning, but when students are used to browsing courseware and can see the answers to questions and learn mathematics knowledge according to courseware, they are no longer willing to calm down and think and explore textbook knowledge. Therefore, in junior high school mathematics teaching, whether from the level of teachers or students, once they become dependent on a certain tool (such as multimedia technology), then this tool will become another "harm" in classroom teaching.

Three. refer to

[1] Ye Xingming. The Application of Multimedia in Junior Middle School Mathematics Teaching [J]. Nanbei Bridge, 2017 (10):126.

[2] Wu Zhong, Jiang,. On the Application of Multimedia in Mathematics Teaching [J]. Journal of Hubei Normal University (Natural Science Edition), 2019 (1):109.

[3] Li Ming. Advantages and disadvantages of applying multimedia in junior high school mathematics teaching [J]. New curriculum, 20 18(8): 132.

[4] Wang Jinxue. The Application and Function of Multimedia in Junior Middle School Mathematics [J]. East, West, North and South (Education), 20 18(2): 183.

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