What should you do if a photographer finds you on campus?

Stand up bravely and ask him to delete the photos he took. The braver you are, the more afraid he is, and he won't dare to take pictures again.

Analytic geometry combines algebra and geometry through coordinates: real numbers correspond to points on a straight line one by one, while real number pairs correspond to points on a plane one by one; The curve on the plane can be represented by an algebraic equation with two rings, while an algebraic equation with two variables represents the curve on the plane.

Applying probability theory to study the regularity of random phenomena; Strict theory proves the statistical method obtained from the experiment; And determine the applicable conditions, formulas, reliability and limitations of each method. Committed to judging the probability of a phenomenon according to a set of samples and controlling the probability of error.

Variable thought began to enter mathematics, which greatly changed the thinking method of mathematics and became one of the most important and basic ideas in modern mathematics. Thus, mathematics can successfully solve the problems related to movement changes put forward by engineering technology and other natural science disciplines.

Based on the statistical laws of a large number of similar random phenomena, this paper makes a scientific and objective judgment on the possibility of the results of random phenomena and makes a quantitative description of its possibility, thus forming a set of mathematical theories and methods.

Turn the problem of geometry into the problem of algebraic calculation and deal with it in this unified way. After the emergence of analytic geometry, there is a unified method to judge the drawing possibility of straightedge in plane geometry, thus solving the drawing problem of three straightedges, and unifying the study of conic properties in conic theory.