Multiplicative commutative law is a calculation rule. When two numbers are multiplied, the position of the exchange factor remains the same. Their product is called multiplication exchange law, and a×b=bxa is represented by letters. Generally, in the formula calculation with only multiplication, the calculation is usually done in the order from left to right. Sometimes, the law of multiplication and exchange can be used to perform simple operations.
Addition, subtraction, multiplication and division are called four operations. Among them, addition and subtraction are called first-order operations; Multiplication and division are called secondary operations. Calculation sequence: when calculating at the same level, it is calculated from left to right in turn; Two-stage operation, first multiply and then divide, then add and subtract. When there are brackets, count the inside of the brackets first, and then the outside of the brackets.
When there are multiple brackets, count the brackets first, then the brackets inside and finally the brackets outside. If there is a power, calculate the power first. When performing mixed operations, the numbers in parentheses are calculated first, and the parentheses are from small to large. If there is a power, calculate the power first, and then from high to low. In the formula calculation with only multiplication, the calculation is generally carried out from left to right.
Multiplication commutative law is an algorithm of multiplication. When two factors are multiplied, the position of the exchange factor and the product remains unchanged, which is called the multiplication exchange law. Multiply the majority, and the product of any two numbers remains the same. When three numbers are multiplied, the positions of the two factors can be exchanged at will, and the product remains unchanged.
The benefits of learning mathematics
People who are good at math are relatively smart and savvy, and they can show their advantages in dealing with people. The faster you think, the more ways and ideas you have. Cambridge, majoring in financial mathematics at Carnegie Mellon University in the United States, said that studying mathematics has brought her mental exercise and made me pay more attention to the rigor of thinking in my life.
For example, before solving a problem, I like to divide it into several sections, and each section is divided into several steps, so that I can dig slowly like a branch instead of thinking in confusion in front of a pile of data. Mathematics is the foundation of other disciplines, and it is easier for people who learn mathematics well to get into other disciplines. Learning software, computer, finance and other engineering majors is even more handy.