What is the maximum number of 1,2,3

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1. The four numbers 3.5 14 28 7 make up different proportions
2. 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
3. Can 2, 3, 4 and 5 form a proportion
4. What are the ways to match 2, 4 and 8 with a number to form a proportion?
5. The proportion of 3 / 4,5 / 4,2 with a number
6. 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?
7. 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
8. Use four numbers 1.3.4.8 to form different four digit numbers and arrange them from small to large. What's the 17th number?
9. If the sum of four digits is equal to 4, from small to large, what number is 2011
10. -24.24.1.3 how to arrange these numbers to be equal to 24
11. How many numbers can be composed of numbers 1, 2 and 3 without repeating numbers
12. How many numbers can be made up of numbers 1, 2, 3
13. What is the maximum number of 1, 2 and 3? There are only three numbers, no other symbols
14. What is the largest number that can be made up of 1, 2, 3?
15. There are three numbers: 3, 5 and 10. Add another number and the proportion is ()
16. Add one of the three numbers 2,5,1 / 3 to form a proportion and write down all possible situations
17. Add another number to 2,5,1 / 3 to form a proportion, and write down all possible situations
18. Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()
19. 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
20. The largest number is 2, 3, 4, 7 and 5______ The minimum number of components is______ ．