Basic contents of elementary algebra: three kinds of numbers-rational number, irrational number and complex number; Three types-algebraic, fractional and radical (collectively referred to as algebra); Three kinds of equations-integral equation, fractional equation, irrational number equation (collectively referred to as algebraic equation), and algebraic equation composed of finite algebraic equations.

Elementary algebra is the continuation and expansion of arithmetic, and the research object of elementary algebra is the operation of algebraic expressions and the solution of algebraic equations.

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Algebraic operations are addition, subtraction, multiplication, division and square root, and the number of times is limited. All elementary algebra has ten rules.

In ancient times, because there were many solutions to mathematical problems in mathematics, there was a systematic and more universal problem to solve various quantitative relations, and a basic algebra was formed. Elementary algebra, English name Elemental Algebra, is a mathematical branch that studies the algebraic operation theory and method of numbers and words, more precisely, the algebraic operation theory and method of real numbers and complex numbers and algebraic expressions with them as coefficients. To put it simply: if we define arithmetic as studying the characteristics of apples, pears, oranges and grapes respectively, then elementary algebra is studying the * * * properties of fruits.