What is the maximum number of 1, 2 and 3? There are only three numbers, no other symbols

The 21st power of 3

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1. How many numbers can be made up of numbers 1, 2, 3
2. How many numbers can be composed of numbers 1, 2 and 3 without repeating numbers
3. What is the maximum number of 1,2,3
4. The four numbers 3.5 14 28 7 make up different proportions
5. Put the four numbers in each group into different proportions (write two each) (1) 3.5 14 28 7 (2) 1 / 4 1 / 5 2.4 3
6. Can 2, 3, 4 and 5 form a proportion
7. What are the ways to match 2, 4 and 8 with a number to form a proportion?
8. The proportion of 3 / 4,5 / 4,2 with a number
9. Put 1,2,3,4,. 5,6,7,8,9 in the nine blanks of the five Olympic rings, so that the sum of the numbers in each circle is equal to 13. How to fill in? The process should be detailed How to determine the four overlapping numbers, 1 + 2 + 3 + 4... + 9 = 65 13 * 5 = 45 65-45 = 20 what do you do next?
10. Input 9 numbers of 123456789 into three sides of triangle (4 numbers for each side). The sum of each side is 17 x x x x x x x x x The border is triangular
11. What is the largest number that can be made up of 1, 2, 3?
12. There are three numbers: 3, 5 and 10. Add another number and the proportion is ()
13. Add one of the three numbers 2,5,1 / 3 to form a proportion and write down all possible situations
14. Add another number to 2,5,1 / 3 to form a proportion, and write down all possible situations
15. Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()
16. Only use 2, 3, 4 and 5 to form a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed
17. The largest number is 2, 3, 4, 7 and 5______ The minimum number of components is______ ．
18. 2. 3, 4 and 5 make up a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed, and 5432,42 ^ 53. Please use "^" for power calculation, such as 2 ^ 8 for the 8th power of 2.)
19. Select four numbers from 3 / 8, 3 / 4, 1.6/7 and 0.8 to form the proportion ()
20. Judgment: four ratios can be made up of three, four, six and eight