1, algebra: based on rational numbers, algebraic expressions and fractions! Rational number corresponds to rational number operation, scientific notation, approximation, real number (cube), square root and so on.

2, geometry: triangle, circle as the core, interspersed with straight lines, rays, line segments, parallel lines, coordinate system, graphic transformation! Triangles are related to line segments (median lines and bisectors), congruent (similar) triangles and special triangles (isosceles triangles, equilateral triangles and right-angled triangles), pythagorean theorem, trigonometric functions (solving triangles) and so on.

3, statistical probability: data collection, processing, analysis, involving histogram, fan chart, median, mode, average, variance and so on! Simple probability calculation, tree diagram!

Characteristics of junior high school mathematics

Generally speaking, junior high school mathematics has the following obvious characteristics:

First, technical terms have increased significantly, such as functions, strings, sets and so on.

Second, the number of "bends" has increased significantly. For example, junior high school math problems often hide the known conditions and let students think and analyze them.

Third, there are more and more "traps". For example, some useless known conditions often appear in some mathematical problems.