Formula introduction:

In mathematics, formula refers to the formula listed in the calculation of numbers (or algebraic expressions), including numbers (or letters instead of numbers) and operation symbols (four operations, power, root, factorial, permutation and combination, etc. ). According to the different calculation methods, the formulas are generally divided into horizontal and vertical.

Unlike expressions, expressions are expressions that connect data of the same type (such as constants, variables, functions, etc.). ) Use operation symbols according to certain rules, and expressions are expressions that connect numbers through operation symbols to calculate results, and need an equal sign.

The meaning of mathematical expression:

Refers to formulas listed in numerical calculations or algebraic expressions. In primary school, the horizontal formula of four operations was listed as vertical calculation, which means that it is more convenient to list a vertical formula in the calculation process. And the sum of numbers is needed. Below the horizontal line, the sum should also be added horizontally.

Formulas play an important role in mathematics, which can help us simplify complex problems and improve calculation efficiency. It is also one of the basic knowledge in mathematics learning.

Introduction to equation:

An equation containing an equal sign is called an equation. Equations can be divided into contradictory equations and conditional equations. Adding (or subtracting) the same algebraic expression on both sides of the equation, or multiplying or dividing the same algebraic expression that is not zero on both sides of the equation, or multiplying the left and right sides of the equation at the same time, the equation still holds.

The form is to connect two equal numbers (or numbers expressed in letters) with "=". Identity, a mathematical concept, is an equation that holds no matter how the variables are taken.

Its significance is as follows:

The properties of equations are the basis of solving equations, and many methods of solving equations should be applied to the properties of equations. If the term is shifted, the properties of the equation 1 are applied; Remove the denominator and apply Attribute 2 of the equation. By using the properties of the equation, when doing division, it should be noted that after conversion, the divisor cannot be 0, otherwise it is meaningless.