First of all, we should know the meaning of the equation, that is, the expression of the equation is called the equation, and the unknown equation is called the equation. It can be seen that the equation must meet two conditions: one is equality; Second, the equation must contain unknowns.

First, the properties of the equation are used to solve the equation.

Because equations are equations, equations have all the properties.

1, the left and right sides of the equation add and subtract the same number at the same time, and the solution of the equation remains unchanged.

2. The left and right sides of the equation are multiplied by the same number that is not 0 at the same time, and the solution of the equation remains unchanged.

3. The left and right sides of the equation are divided by the same number that is not 0 at the same time, and the solution of the equation remains unchanged.

Second, the solution of two-step and three-step operation equations

The two-step and three-step operation equations can be operated according to the properties of the equations. Firstly, the original equation is transformed into a one-step solution equation, and then the solution of the equation is obtained.

Third, solve the equation according to the relationship between the parts of the addition, subtraction, multiplication and division method.

1. Solve the equation according to the relationship between parts.

2. Solve the equation according to the relationship of each part in subtraction: in subtraction, slow down = difference+subtraction.

3. Solve the equation according to the relationship between the parts in multiplication: in multiplication, one factor = product/another factor.

For example, list equations and find their solutions.

4. Solve the equation according to the relationship of each part in division.

After solving the equation, it is necessary to verify whether the obtained solution is effective by testing. This requires first substituting the unknown value into the original equation to see if the number on the left and the number on the right of the equation are equal. If the numbers are equal, the value is the solution of the original equation; If the numbers are not equal, it is not the solution of the original equation.