1, the geometric meaning of reciprocal on the number axis, and the two numbers represented by two points with the same distance to both sides of the origin are reciprocal.

2. On the number axis, two points with opposite numbers (except 0) are located on both sides of the origin and are symmetrical about the origin.

3. At this point, the inverse number of b is ﹣b=﹣(﹣a)=a, then we say that "the inverse number has mutual symmetry".

geometry

? It is a subject that studies the spatial structure and nature. It is one of the most basic research contents in mathematics, which has the same important position as analysis and algebra, and has a very close relationship. Geometry has a long history and rich contents. It is closely related to algebra, analysis and number theory. Geometric thought is the most important thought in mathematics. The temporary development of each branch of mathematics tends to geometry, that is, to explore various mathematical theories with geometric viewpoints and thinking methods. Common theorems are Pythagorean Theorem, euler theorem Theorem and Stewart Theorem.