1. division
Division is one of the four operations. Given the product of two factors and a non-zero factor, the operation of finding another factor is called division.
Division of two numbers is also called the ratio of two numbers. If ab=c(b≠0), the operation of finding another factor A by multiplying the product C and the factor B is division, which is marked as c÷b and pronounced as C divided by B (or B divided by C). Among them, c is called dividend, b is called divisor, and the result of a operation is called quotient.
In mathematics, when the first-level operation (addition and subtraction) and the second-level operation (multiplication and division) are in the same formula at the same time, their operation order is multiplication and division first, then addition and subtraction. If there are parentheses, the order of operations at the same level is from left to right. Such operations are called four operations.
The fourth refers to the calculation rules of addition, subtraction, multiplication and division. The expressions of four operations do not necessarily have four operation symbols. Generally, it refers to the operation of combining the majority into a number with two or more operation symbols and brackets.
Step 2: Simple operation
Simple calculation is a special kind of calculation, which makes use of the algorithm and the basic properties of numbers, thus making the calculation simple and making it easy to calculate numbers from very complicated formulas.
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 (also called finding common divisor), especially when A and B are complementary to each other, this method is more useful.
Sometimes the law of additive combination is used, for example, a+b+c, and B and C are complementary, so that B and C can be combined and multiplied by A. If+in the above formula is replaced by X, it can also be simply calculated by the 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 multiply the first two numbers, and then multiply the third number.