5 5x22 with the easy way?

Easy calculation:

Here you can use the decomposition method for easy calculations.

Multiply a number by a two-digit number, and decompose the two-digit number into two single-digit multiplication forms according to the situation, and then use this number to multiply two single-digit numbers in a row to make the calculation easy.

Example: Calculation: 45 18

Break down 18 into 2 9 and remove the brackets to make the calculation easier.

The calculation process is as follows:

Extended information: first align the last digit of the two multipliers, then use the second multiplier respectively, multiply a multiplier by each digit from the last digit, and finally add up the calculated result to be the product, if the multiplier is a decimal place, it can be expanded by the corresponding multiplier first, and finally the product is reduced by the corresponding multiple;

Clever calculation and problem solving ideas: four operation rules (calculation in order, first multiplication and division and then addition and subtraction, parentheses are calculated first brackets, and there are power first calculation of the multiplication) that is, the off-form operation (recursive equality calculation) needs to be carried out under the premise of this principle. Problem solving process:

Extended Information Vertical calculation: first align the last digit of the two multipliers, then use the second multiplier respectively, multiply a multiplier for each digit from the last digit to each digit in turn, and finally add up the calculated result to be the product, if the multiplier is a decimal place, it can be expanded by the corresponding multiple, and finally the product is reduced by the corresponding multiple;

Problem solving: Step 1: 2 55=110

Step 2: 2 55 = 1100

According to the above calculation steps, the combination result is moved to the left, and the product of 1 decimal point is 121, please ask if you are in doubt, and you are satisfied.

==10x10×

20 with, last.

In short, the purpose is to find the number related to 4, find 8, and make up hundreds of integers.

The calculation process is as follows:

Additive Properties:From the commutative and associative properties of addition, it can be obtained: several additions are added, and the positions of the additions can be arbitrarily exchanged; Or add a few additions and then add them to the other additions, and their sum does not change.

For example: 34 + 72 + 66 + 28 = (34 + 66) + (72 + 28) = 200.

The nuclear loss is positive. > the distributive property of multiplication.

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

On the contrary, axb+axc=ax(b+c) is called the inverse application of the multiplicative distributive law (also called extracting the common divisor, especially when a and b are complements each other, this method is more repentant). 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 multiplicative associativity 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 it is not used very much in daily life in combination with law air disturbance, mainly in some more complex operations to play a simple role.

The commutative law of multiplication.

The commutative property of multiplication is used to invert the positions of individual numbers: a b = b a.

The easy way to do this is as follows:

Easy Calculation Law:

1. Multiplicative commutative lawThe multiplicative commutative law is used to swap the positions of each number: a b = b a4, the nature of subtraction: a number subtracting several numbers in a row is equal to a number minus the sum of these numbers.

The letter indicates: a-b-b = a-(b+c).

2. The nature of division: a number divided by several numbers in a row (except 0) is equal to the product of a number divided by these numbers.

The letter indicates: a b c = a (b c).

3. The concept of the law of quotient invariance: the quotient of the dividend and the divisor multiplied or divided by the same number at the same time (except 0) their quotient is constant.

Letter formula: a b = (an) (bn) = (a n) (b n) (n≠0 b≠0).

One by one (ten Huai rented wild.

One (ten lead shouts one 5 one.)

Twenty-one type of Xun.

This is a mixed operation of the stare posture, there is no good way to stare and infiltrate the simple operation, you can calculate it directly, and the spine fruit of the knot is the result.

The simple way to touch is as follows:

Xiaoqin 5

Hello, there is no easy way to calculate this formula, it can only be calculated directly.

Didn't see any easy way.

Regarding the simple solution to the equation, the detailed process of annihilation is as follows:

The simple and square old companion is stupid with the mu method.

The bridge can be judged to be converted into a rush to be so.

If you can get it, you can get the answer.

You can break it down into 4 8 and then use 25 8 or then they redistribute it so you can do it.

You have a good grasp of it, the simple algorithm for this problem is to use multiplication to assign guess and guess calculations. Original dust Zhaoqing = (2+.

That's five out of two.

That's a quarter.

Multiply it to make five eighths.

The friendship type bend source suggests that the following respectful divination posture should be memorized.

Get two digits after that: 5 5 25

Get the first two digits of the number: n (n 1).