![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
1,2,3,4,5,6,7,8,9, these 9 numbers should not be repeated. Write a multiplication formula of four digits multiplied by one digit to get four digit numbers most urgent
The answer is:
1963×4=7852
1738×4=6952
Multiply 1, 2, 3, 4, 5, 6, 7, 8, 9 by one number to make the other four digits Numbers cannot be repeated
There are two groups of answers:
1738×5＝6952
1963×4＝7852
There's a six digit number, and when it's multiplied by 2, 3, 4, 5, 6, the result is still a six digit number, all numbers are the same The answer is 142857. Why? Please prove whether there are any numbers suitable for this condition
"7" is one of them. 1 / 7 = 0.142857 142857 142857... 2 / 7 = 0.285714 285714 285714... 3 / 7 = 0.428571 428571 428571... 4 / 7 = 0.571428 571428 571428... 5 / 7 = 0.714285 714285 714285... 6
Use 0,1,2 9 ten digits, which can form the number of three digits with repeated numbers
That's the number of all three digits
There are 999-100 + 1 = 900
What do not understand can continue to ask, at any time online
It is composed of 1-9. There must be 3 digits in 3 digits. How many combinations are there? Analysis: There are two kinds of combinations of 3-digit repetition: three numbers are the same, there are C19 = 9 kinds; only two numbers are the same, there are c19c18c13 = 216 kinds. Therefore, there are 9 + 216 = 225 kinds of combinations. I understand all the above, that is, how to explain C13. I don't quite understand. Please explain in detail, thank you
C19 takes one of nine numbers as two
C18 is one of the remaining eight numbers
C13 is to select a position from three digits to put that number
For example, C19 chooses 2 and C18 chooses 1. Then there are three possibilities of three digits, namely, C13
How many four digits can be made up of 1, 2, 3 and 4 without repeating numbers? Line them up. What number is 4123?
(1) 4 × 3 × 2 × 1 = 24,
(2) There are 3 × 2 × 1 = 6,
There are 3 × 2 × 1 = 6,
There are 3 × 2 × 1 = 6,
There are 3 × 2 × 1 = 6,
However, the number of four thousand bit operators (from small to large): 4123 4132 4213 4231 4312 4321,
6 × 3 + 1 = 19,
A: you can make up 24 four digit numbers without repeating numbers. Put them together. 4123 is the 19th number from small to large
The four digits of 1.2.3.4 can be used to make up many non repeating four digits. What is the sum of all these four digits? List the formula
In other words, the final result is 1000 * (1 + 2 + 3 + 4) * 6 + 1 * (1 + 2 + 3 + 4) * 6 + 1 * (1 + 2 + 3 + 4) * 6 + 1 * (1 + 2 + 3 + 4) * 6 + 1 * (1 + 2 + 3 + 4) * 6 = (1000 + 100 + 10 + 1) * (1 + 2 + 3 + 4) * 6 = 6666
Multiply the product of 1-8 eight digits into a hundred digit number, which is a thousand digit number. Eight numbers cannot be repeated
453 × 6 = 2718 or 582 × 3 = 1746
Use 1,2.3.4.5,6.7,8.9 to form an equation of four digits multiplied by one digit, which is equal to the other four digits. Each digit can only be used once
1963×4=7852
1738×4=6952
Five numbers, each containing 8. Let these five numbers add up to 1000. What are these five numbers Each number contains only one 8
If the sum of five 8's is 40, then if it is 0 in 10 bits, it needs to add 2 8's in 10 bits
The sum of two 8's is 16, and the 4 added by one digit is 20. Then if a hundred is 0, it needs an 8 in the hundreds
Just got into one, so I can write it out
8+8+8+88+888=1000
RELATED INFORMATIONS
- 1. How to change the number 8 into 5 and add up to 1000
- 2. Use 1, 2, 3, 4, 5, 6, 7, 8, 9 to form two four digits, so that their sum is 1000
- 3. How many non repeating three digit numbers can be made up of six numbers: 0,1,2,3,4,5?
- 4. How many non repeating numbers can nine numbers make up three digits?
- 5. Use 1,2,3,4,5,6,7, seven numbers to make up seven digits without repetition, in which the odd number is more than the even number? How many even numbers are not adjacent? How many even numbers are on the even digits?
- 6. 2. When a () or () or (), these four numbers can form a proportion
- 7. There are 2, 3, 4, 3, 3, 3, 3, 3, 3, 4, 3, 4, 3, 4, 3, 4, 3, 3, 4, 3, 3, 4, 3, 4, 3, 3, 4, 3, 3, 3, 4, 3, 3, 3, 4, 3, 3, 3, 4, 3, 3
- 8. Given that 1 / 2, 1 / 3 and 3 / 4 of the three numbers, together with the ratio of one number to the original three numbers, write out all possible numbers
- 9. The ratio of 5,8,15 and 24 is 8 / 5: (): () = (): ()
- 10. Which group of four numbers can form a proportion? Write down the proportion One half, one third, one sixth, one fourth Just change four groups and you can't repeat them
- 11. Arrange all six digits of two 3's and 4 0's in descending order
- 12. From 0 to 9, how many four digits can be divided by 5?
- 13. Five numbers 0,1,2,3,4 can be used to form three even numbers which are not allowed to repeat I know the answer is 30, and I want the process to be done in a combinatorial sequence
- 14. Permutation and combination: take any three of the six numbers 1, 2, 3, 4, 5, 6 to form 3-digit even numbers which can not be repeated?
- 15. Take any two of the five numbers 1, 3, 5, 7, 9, and any two from the four numbers 0, 2, 4, 6 Take any two of the five numbers 1, 3, 5, 7, 9, and any two from the four numbers 0, 2, 4, 6 ask 1. How many four digits can be formed without repeating numbers? 2. How many even four digit numbers without repeating numbers can be formed?
- 16. Number permutation and combination 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 these numbers can be grouped into 11 groups. How many groups can we arrange
- 17. A school selects three teachers from six teachers to support teaching in three remote areas at the same time, with one person in each place. Among them, a and B go differently, and a and C can only go together or not at the same time______ Species
- 18. Add "+" or "- before the numbers 2, 3, 4, 5, 6, 7, 8, 9 to make the sum of them be - 10. How can you think of several ways?
- 19. From one to six, every four numbers are combined. How many combinations are there How? Or what do you think? It's important to me
- 20. Observe the following group of numbers in regular order: - 1,2, - 3,4, - 5,6, - 7,8... Then what is the number 2006?