1, addition

Addition is the most basic operation, and its operation result is the result of adding two numbers. For example, 3+2=5, which is symbolized as 3+2=5.

Step 2 subtract

Subtraction is also a common operation, and its operation result is the result of subtracting two numbers. For example, 5-2=3, symbolized as 5-2=3.

Step 3 increase

Multiplication is a complex operation, and its operation result is the result of multiplication of two numbers. For example: 3X2=6, symbolized 3x2 = 6.

Step 4 separate

Division is a complex operation, and its operation result is the result of dividing two numbers. For example, 6÷2=3, which is symbolized as 6÷2=3.

5. Square root

Square root is to find the square root of a number, that is to say, to find the product of one number is equal to another number, and its operation result is to find the square root of a number.

6. Percentage

Percentage represents the proportion of a number to the total, and its operation result is the proportion of a number to the total. For example: 50%=0.5.

7. Equation

One-dimensional quadratic equation is a mathematical formula when there are two unknowns, and its operation result is to find the values of these two unknowns. For example: 2x2-2x+ 1=0, which means 2x2-2x+ 1=0.

8. Index

Exponent refers to the number of times a number multiplies itself, and its operation result is that this number multiplies its own number.

Common operating rules:

1, multiplication commutation law

When two numbers are multiplied, two factors are multiplied according to the calculation order from left to right, and the position of the exchange factor remains unchanged.

The formula of multiplicative commutative law: a× b = b× a.

2. Multiplicative associative law

Multiply three numbers, the first two numbers are multiplied and then multiplied, or the last two numbers are multiplied and then multiplied, and the product remains the same.

The formula of multiplicative associative law (a×b)×c=a×(b×c).

3. Law of Multiplication and Distribution

When the sum of two numbers is multiplied by a number, you can multiply this number separately and then add the products.

The formula of multiplication and distribution law: (a+b) × c = a× c+b× c.

4. Additive associative law

When adding three numbers, first add the first two numbers, then add another number, or add the last two numbers, then add two and one number, and the sum remains unchanged. associative law of addition

The formula of additive associative law is: (a+b)+c=a+(b+c).