First simplify, then calculate 2x ^ - 18 / 4-4x + x ^ △ 3-x / x ^ + X-6, where x = 4

First simplify, then calculate 2x ^ - 18 / 4-4x + x ^ △ 3-x / x ^ + X-6, where x = 4

Lejia supermarket has 132 bags of milk powder. The number of bags of milk powder is 1.2 times that of milk powder. How many bags of milk powder and milk powder?

Suppose there are x bags of milk powder, then there are 1.2x bags of soybean milk powder. According to the meaning of the question, we can get the equation: x + 1.2x = 132, the solution is x = 60, 1.2 × 60 = 72 (bags). Answer: there are 60 bags of milk powder and 72 bags of soybean milk powder

A new batch of computers of the same model are purchased in a shopping mall, and the price is increased by 40% according to the purchase price (that is, the price indicated on the price plate). In order to promote sales, the shopping mall gives a 20% discount to the computers (20% discount means that the actual price is 80% of the price). Each computer can still make a profit of 420 yuan, so the purchase price of each computer of this model is______ Yuan

Let the purchase price of this model of computer be x yuan. According to the equation, we get: (x + 40% x) × 0.8-x = 420, and the solution is: x = 3500. The purchase price of this model of computer is 3500 yuan

A shopping mall will increase the price of each computer by 40%
A shopping mall will increase the price of each computer by 40%, and then sell it with 80% discount. As a result, each computer earns X Yuan. Please use algebraic expression to express the price of each computer. If x = 720, what is the price of each computer

Suppose the purchase price of each computer is a, then the price is a * (1 + 0.4), so the selling price is a * 1.4 * 0.8
The profit is a * 1.4 * 0.8-a = 0.12A, i.e. x = 0.12A
Because x = 720, the purchase price is a = 6000

How many three digits can you make up by randomly selecting three digits from eight, six, two and seven?

4×3×2=24

Use eight numbers 1, 2, 3, 4, 5, 6, 7, 8, 9 to form two different four digit numbers, so that the difference between them is 4

5 6 7 8
1 2 3 4
____________
eight thousand six hundred and seventy-nine
four thousand two hundred and thirty-five
________

Use 6, 7 and 5 to form a three digit number. What is the possibility that the three digit number is a multiple of 5______ The probability of greater than 576 is______ The probability of less than 765 is______ ．

All the three digit numbers composed of 6, 7 and 5 are 657, 675, 567, 576, 756 and 765, of which: (1) there are 2 multiples of 5, 675 and 765, and the possibility is 2 △ 6 = 26 = 13; (2) there are 4 numbers greater than 576, 657, 675, 756 and 765, and the possibility is 4 △ 6 = 46 =

Here are six numbers 4,7,8,2,1,5. Please make these six numbers into a six digit number
Five times of the number should still be six digits of the six digits. Please write four such six digits

142857*5=714285
148257*5=741285
174825*5=874125
174285*5=871425

There are six cards with 478125, five times of their six digit number is still a six digit number

874125÷5＝174825
That's all I know!

Series and set of numbers (High School Mathematics) p135
Question:
What are the differences and relations between the concepts of sequence and set of numbers?
The difference should be that one is the number that changes according to the law, the other is that there is no law,
What's the connection?

1) There are infinitely many numbers in the sequence, and the set of numbers is to package some numbers to form a whole;
2) There can be infinitely many numbers in the set of numbers, or there can be only a finite number, and there can be infinitely many numbers in the sequence of numbers;
3) For the sequence of numbers, we mainly discuss its tendency, whether there is a limit, whether their sum exists or not; for the set of logarithms, we are mainly concerned with the numbers in the set and their properties;
4) In terms of connection, the elements in an infinite countable number set can form different sequences according to different orders. These sequences do not necessarily include all the elements in the set