0 789x21 7 89x4 4 789x0 35Easy calculation?

Easy to calculate.

The core of simple operation is to use the laws of addition and multiplication to calculate, and calculate the integer part to facilitate the subsequent calculation. Problem solving process:

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;

789 415 Problem Solving Process:

Step 1: 5 789 = 3945

Step 2: 1 789 = 7890

Step 3: 4 789 = 315600

According to the results of the above steps, the product is added to 327435, because the multiplier is expanded by a total of 1000 times, so the product needs to be reduced by 1000 times.

Calculation: If in doubt, please ask, satisfied.

Easy to calculate. 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. Conversely, axb+axc=ax(b+c) is called the inverse of the multiplicative distributive law (also known as extracting the common divisor, especially when a and b are complements 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 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 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）

Bird Brigade. The disadvantages are more than 1+

Remember to rent and roll!

Use the multiplication method to divide the auspicious foundation stool with the law to carry out the first draft calculation.

According to the distributive law of conditions and multiplication, get. Original =

Simple operation using the multiplicative distributive property.

Summary. Easy to calculate.

Easy to calculate. Easy to calculate.

Teacher, no, how did it become?

I took the enlargement tenfold and the 16 shrunk by one-tenth <><

So the number is still the same drop.

1. First of all, convert the formula to:

2. Secondly, Huai Hexu calculates that the common factor of lead combustion is clapped, that is.

3. The final equation is 10.