8 4 8 4 2 1 7 3, easy to calculate?

Off-line calculations (

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

Extended data - vertical calculation - calculation result: 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 multiple, and finally the product is reduced by the corresponding multiple;

Problem solving: Step 1: 3 124=372

Step 2: 7 124 = 8680

According to the above calculation steps, the combined result is:

If you have any doubts, please ask and be satisfied.

Hello. There's no symbol in between.

Off-line calculations (is a mathematical discipline term, i.e., a recursive equation.

Calculation, the operation of writing the calculation process in its entirety, that is, the calculation that is out of the vertical form.

In the four arithmetic.

, addition and subtraction are called first-level operations, and multiplication and division are called second-level operations. An equation that contains two or more operations is often referred to as a hybrid operation. The mixed operations of addition, subtraction, multiplication, and division are also called four mixed operations.

In the four mixed operations, the specified order of calculations is called the order of operations. The mathematically prescribed order of four operations is as follows:

1) Sibling operations in an equation, if only sibling operations are included, they should be performed in order from left to right. That is, mixed operations with only addition and subtraction, or only multiplication and division, in the order of operation from left to right.

2) Level 1 to 2 operations.

In an equation, if there are both first-level and second-level operations, then the second-level operation should be calculated first, and then the first-level operation. That is, "multiplication and division first, then addition and subtraction", referred to as "multiplication and division first, then addition and subtraction".

3) Parenthetical operations.

If you want to change the order of operations mentioned above, you need to use parentheses. There are three commonly used parentheses: small parentheses, which are denoted as parentheses in ( ).

Written as [ ; Braces.

When using parentheses, pull them on both sides and add them in the middle. Use parentheses first, then braces, and finally curly braces.

In an equation, if there are several parentheses, you should first calculate the multiplication or division in the parentheses, then the addition or subtraction in the parentheses, and finally the braces. When calculating, the formula inside the parentheses should be calculated in the order mentioned above, and then the resulting result should be calculated in the same order as the numbers outside the parentheses. As an example:

5) Simple algorithm to change the sign If there is a minus sign outside the parentheses, there is a plus sign or a minus sign inside the parentheses, and the number in the brackets is changed. The parentheses are outside the plus sign, and the parentheses are plus or minus, and the sign is unchanged.

The simple calculation process is as simple as the removal of Rankai.

1. Extract the original formula:

2. Calculation process:

3. Calculate the results of Sun Ju:

4. Thank you, looking forward to your dates.

Hello, the simple calculation of the problem is to use multiplication to discuss the distributive law.

Original = . Fight this.

Example.

Use the pat to infiltrate the multiplication method of the spine distribution law:

Solution: Extract the boredom factor of the common chong, and then use the multiplication distribution law (you can also do the partial subtraction of the scattered bend, and only subtract by blind blocking, which can be quickly calculated.)

First put forward the same kind of filial piety, that is, put it forward, and then let the remaining two do the subtraction, that is, wait for the front hall to be 100, so the silver is now multiplied by 100 is equal to 840.

Using the multiplicative distribution law, the number of common causes is extracted, the circle is split, rounded, and the operation is simple. Wide collapse.

Simple calculation and demolition process:

Biyan (will decompose the repentance of the imperial silver for.)

Multiplicative distributive property).

The multiplicative distributive property of the row hood high-grade ruler is used.

Stuffy training

Dongdan uses the multiplicative distribution law to extract the common factor, and simply calculates the remainder of the calculation.