Squaring is an operation. For example, the square of A means a×a, which can be abbreviated as A, or it can be written as A× A (the first power of A times the first power of A equals the second power of A), for example, 4×4= 16, 8×8=64, and the square symbol is 2.

2. Cubic

Cubes are also called cubes. The product of three identical numbers is called the cube of this number. For example, 5×5×5 is called the cube of 5, and it is recorded as 5? .

3. Equation

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".

4. Solution set

Solution set is a mathematical term, which refers to all solutions of an equation (group) or inequality (group) as a set of elements, and is called the solution set of the equation (group) or inequality (group). There are three ways to express the solution set: enumeration, description and illustration. As an important tool in mathematics, solution set has a wide range of applications in mathematics.

Step 5: Arrange

Arrangement, generally speaking, m(m≤n) elements are taken from n different elements and arranged in a column in a certain order, which is called the arrangement of taking m elements from n elements. In particular, when m=n, this arrangement is called full arrangement.