1, specific solutions

Look-see if both sides of the equal sign can be calculated directly; Change-if the two sides can't be calculated directly, use the sum-difference product quotient formula to change the equation; Pass-through-divide items that can be added or subtracted.

Division-both sides are divided by a non-zero number at the same time; Items that all contain unknowns can be added or subtracted, or items that all contain unknowns can be added or subtracted; Dividing by a number is equal to multiplying the reciprocal of this number.

2. Important features

Is an equation; The equation contains a denominator; Denominator contains unknowns; The difference between fractional equation and integral equation lies in whether there are unknowns (not ordinary letter coefficients) in denominator. An equation with unknowns in the denominator is a fractional equation, and an equation without unknowns in the denominator is an integral equation. The connection between fractional equation and integral equation: Fractional equation can be transformed into integral equation.

Definition of equation and steps of solving equation;

1, definition

An equation refers to an equation containing unknowns. It is an equation that represents the equal relationship between two mathematical expressions (such as two numbers, functions, quantities and operations), and the value of the unknown quantity that makes the equation hold is called "solution" or "root". The process of finding the solution of the equation is called "solving the equation".

By solving the equation, we can avoid the difficulty of reverse thinking and directly list the equations with the quantity to be solved. There are many forms of equations, such as one-dimensional linear equation, two-dimensional linear equation, one-dimensional quadratic equation and so on. , can also be combined into equations to solve multiple unknowns.

2, the steps to solve the equation

Equation, referred to as equation for short, is an equation with unknown numbers. Unknown: xyz is usually set as unknown, and other letters can be set, all lowercase letters can be used. "Quadratic": The concept of quadratic in the equation is similar to algebraic expression. It refers to the project with the largest number of unknown projects. The term with the highest degree is the degree of the equation.

"Solution": the solution of the equation, which means that the root of the equation is the value of the unknown on both sides of the equation, and the solution of the unary equation, both of which can be commonly used. Solving equation: the process of finding the solution of the equation, which can also be said to be the process of finding the value of the unknown quantity in the equation, or the process of explaining that the equation has no solution is called solving the equation.