Can 2, 3, 4 and 5 form a proportion

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• 1. What are the ways to match 2, 4 and 8 with a number to form a proportion?
• 2. The proportion of 3 / 4,5 / 4,2 with a number
• 3. 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?
• 4. 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
• 5. 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?
• 6. If the sum of four digits is equal to 4, from small to large, what number is 2011
• 7. -24.24.1.3 how to arrange these numbers to be equal to 24
• 8. There are three one digit numbers (0-9). They can be used to form three digit numbers. There are six ways to arrange them. Six three digit numbers can be formed There are three one digit numbers (0-9). They can be used to form three digit numbers. There are six permutation methods, which can form six three digit numbers. It is known that the sum of five three digit numbers is 3194. Find another three digit number
• 9. What are the three digits randomly combined with 0-9, and each digit can be repeated For example, 123.321.524.163 If the number of hundred can be zero, what are the specific numbers? Give a calculation method or software
• 10. How much is 1 mm?
• 11. 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
• 12. The four numbers 3.5 14 28 7 make up different proportions
• 13. What is the maximum number of 1,2,3
• 14. How many numbers can be composed of numbers 1, 2 and 3 without repeating numbers
• 15. How many numbers can be made up of numbers 1, 2, 3
• 16. What is the maximum number of 1, 2 and 3? There are only three numbers, no other symbols
• 17. What is the largest number that can be made up of 1, 2, 3?
• 18. There are three numbers: 3, 5 and 10. Add another number and the proportion is ()
• 19. Add one of the three numbers 2,5,1 / 3 to form a proportion and write down all possible situations
• 20. Add another number to 2,5,1 / 3 to form a proportion, and write down all possible situations