199 mathematics is also called elementary mathematics (English: elementary? Mathematics), referred to as the initial number, refers to the mathematics content usually taught in primary or secondary schools, as opposed to advanced mathematics. Elementary mathematics mainly includes geometry and algebra. Elementary school integer, fraction and four operations, number and algebra, space and graphics, simple statistics and possibility, linear equation of one variable, circle, positive and negative numbers, preliminary study of solid geometry.
Algebra part: rational numbers (positive numbers and negative numbers and their operations), real numbers (operations of roots), plane rectangular coordinate system, basic functions (linear functions, quadratic functions and inverse proportional functions), simple statistics, acute trigonometric functions, equations, (one-dimensional linear equations, two-dimensional linear equations and three-dimensional linear equations), factorization, algebraic expressions and fractional equations.
History of mathematics:
The period of elementary mathematics lasted more than two thousand years from the fifth century BC to the seventeenth century AD, and ended with the establishment of advanced mathematics. The most obvious achievement in this period is the systematic establishment of elementary mathematics, that is, arithmetic, elementary algebra, elementary geometry (plane geometry and solid geometry) and plane triangle in the current primary and secondary school curriculum.
The period of elementary mathematics can be divided into two parts according to different contents, namely, the period of geometric development (to the second century AD) and the period of algebraic priority development (from the second century AD to the seventeenth century AD). It can also be divided into "Greek period", "Oriental period" and "European Renaissance period" according to different historical conditions.