Considering the urgent needs of teachers and students, according to the progress of the new textbook, the author compiled this set of junior high school mathematics competition courses for grades seven, eight and nine. The topic is selected from domestic and foreign competition papers, and the editor is a high school teacher who has been engaged in mathematics competitions for many years. The timeliness, practicability and guidance of the topic selection are very good.

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According to the problem-solving manual of junior high school mathematics competition course (grade 9), everyone wants to be better, faster and stronger, so there are various competition activities, such as Olympic Games. Mathematics, as a gymnastics to exercise thinking, is a subject that can fully show the flexibility of thinking, and it is naturally chosen to test people's innovative thinking ability, so the Mathematical Olympics, that is, the Mathematical Competition, appeared. Because of the great role of mathematics competition in stimulating teenagers' interest in learning mathematics, cultivating the spirit of hard study, promoting and improving the level of mathematics teaching, discovering scientific and technological talents and cultivating scientific and technological reserve forces, mathematics competition is like spring grass, full of vitality and has achieved gratifying results. Since China participated in the International Mathematical Olympiad, she has made good achievements every year and has been in the top few. China's outstanding performance has won great honor for the motherland. A large number of outstanding young athletes have emerged in previous mathematics competitions in primary and secondary schools in China, and most of them have made their mark in future study, scientific research and production, and achieved remarkable results.