1, multiplicative distribution law
The most commonly used method in simple calculation is multiplication and distribution law. Multiplication and division means ax(b+c)=axb+axc, where A, B and C are arbitrary real numbers. On the contrary, axb+axc=ax(b+c) is called the inverse application of multiplication and division.
2. Multiplicative associative law
The multiplicative associative law is also a simple method, which is expressed by letters as (a×b)×c=a×(b×c). Its definition (method) is: multiply three numbers, first by the first two numbers, then by the third number; Or multiply the last two numbers first, and then multiply the first number, and the product remains the same.
3. Multiplication and distribution law refers to the sum of two numbers multiplied by one number. You can multiply them by this number first and then add them up. (a+b)×c=a×c+b×c (letter) × c+b× c = (a+b) × c.
4. Multiplicative commutative law
Multiplicative commutative law is used to exchange the positions of various numbers: a× b = b× a.
5. additive commutative law
Additive commutative law is used to exchange various numbers: a+b = b+a.
Application of operation law
The use of algorithms can be a simple formula or a special calculation. It makes use of the algorithm and the basic properties of numbers, which makes the calculation simple and makes it easy to calculate numbers from very complicated formulas.
When performing simple operations (four operations), we should pay attention to the relationship between operation symbols (multiplication, division, addition and subtraction) and big, middle and small brackets. Don't skip the operation to avoid mistakes.