How do you write 4 6 5 4 2 8?

Hello. In the operation of numbers, there are four kinds of operations: addition (+), subtraction (-), multiplication ( ) and division ( ), and we are mathematically in order to be able to calculate them more conveniently, referred to as simple calculation, and there are the following kinds of simple calculations (see the product of commonly used special numbers and the simplified calculation formula for details).

Addition: (Commutative Law of Addition) (Associative Law of Addition.

Approximate number. Multiplication: (multiplicative commutative law) (multiplicative associative law.

Multiplicative distributive property.

Multiplicative distributive variation (four)).

Subtraction: (basic properties of subtraction) (approximate number).

Division: (basic property of division) (invariant property of quotient).

This is elementary school math.

One of the most common types of calculation problems. From the beginning of students' contact with computing, the idea of simple operation is infiltrated from various angles, and in the fourth grade, simple operation is officially presented as an independent question type in the calculation problem, which is the most flexible one of the calculation problems, which can make the flexibility of students' thinking be fully exercised, and will play a very big role in improving students' computing ability. What is simple arithmetic is a very simple question, but in order to understand it correctly, it is absolutely not necessary to perform simple arithmetic for the sake of simple form.

In this regard, my understanding is that simple operation should be flexible, correct and reasonable use of various definitions, theorems, laws, properties, laws, etc., change the original order of operation for calculation, and greatly improve the calculation speed and accuracy through simple operation, so as to make complex calculations simple. That is to say:

The most important thing is to apply various definitions, theorems, laws, properties, and laws flexibly and reasonably. In particular, "flexibility" and "reasonableness" should be emphasized.

Multiplication. In plus. That's what she does.

Summary. How to write a simple calculation.

Law. Multiplicative distributive property.

Easy to calculate. The most commonly used almanac method is the multiplicative distributive law. The multiplicative distributive property refers to ax(b+c) = axb+axc, where a, b, c are arbitrary real numbers.

Conversely, axb+axc=ax(b+c) is called the inverse application of the multiplicative division of the chaotic collocation (also called extracting the common divisor, especially when a and b are complements to each other, this method is more useful. There are also times when the associative law of addition is used.

For example, if a + b + c and b and c are complements to each other, you can combine b and c and multiply it with a. For example, if the + in the above equation is changed to x, the multiplication associative law is used.

It can also be easily calculated.

The associative law of multiplication.

The associative law of multiplication is also a method of doing simple operations, which is expressed by letters as (a b) c = a (b c), and its definition (method) is: multiply three numbers, first multiply the first two numbers, and then multiply the third number; Or multiply the last two numbers first, and then multiply them with the first number, and the product remains the same. It can change the order of operations in multiplication operations, and the multiplication law is not used very much in daily life, mainly in some more complex operations to play a simple role.

The commutative law of multiplication.

The multiplicative commutative law is used to swap the positions of individual numbers: a b = b a additive commutative law.

The additive commutative property is used to swap the positions of individual numbers: a+b=b+a, the additive associative law.

a+b）+c=a+（b+c）

Summary. Hello, dear, the simple operation process of this problem is:

How to write a simple calculation.

Hello, dear, the simple operation process of this problem is:

Solution: This problem can be calculated according to the four rules of operation, first calculated, and then their traces and holes are added together. Calculation process.

Dongzhou Yu.

The multiplicative distributive law is applied.

The simple operation is to directly extract the original formula of the common divisor =

Simple calculation.

Variation of the original formula of the oak stupidity:

Apply the associative law of multiplication and attack:

Just continue to calculate and call like a brother.

Jian Dan is not equal to staring at 580

Extracting Jinxin Chong Zai Xiang Zhan Tanlu calculation 99 + 1 = 100 calculation becomes simpler.

Simple arithmetic how to write a round of mintan. Na Ji 4