Select four numbers from 3 / 8, 3 / 4, 1.6/7 and 0.8 to form the proportion ()

No proportion

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1. 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.)
2. The largest number is 2, 3, 4, 7 and 5______ The minimum number of components is______ ．
3. 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
4. Judgment question: by 2, 3, 4, 5 four numbers, can form a proportion ()
5. Add another number to 2,5,1 / 3 to form a proportion, and write down all possible situations
6. Add one of the three numbers 2,5,1 / 3 to form a proportion and write down all possible situations
7. There are three numbers: 3, 5 and 10. Add another number and the proportion is ()
8. What is the largest number that can be made up of 1, 2, 3?
9. What is the maximum number of 1, 2 and 3? There are only three numbers, no other symbols
10. How many numbers can be made up of numbers 1, 2, 3
11. Judgment: four ratios can be made up of three, four, six and eight
12. 4 0.125 2.58 make these four numbers into different proportions (only two groups)
13. Think about it: can you use the four numbers 2.8.0.2.7.0.5 to form different ratios? Write at least four groups of ratios
14. Mathematical Olympiad in grade six of primary school 1. In the first 50 natural numbers, arbitrarily take two different numbers and add them together. How many different ways are there when the sum is even? 2. Only brackets, addition, subtraction, multiplication and division can be added. Write a formula with the number of 3, 3, 8 and 8 and the result is 24 Thank you for your answer. Could you be more specific in the first question?
15. Sixth grade mathematics Olympiad! Urgent! 1. My mother bought some apples. She ate 1 / 3 and 1 / 3 apples on the first day, left 1 / 4 and 1 / 4 apples on the second day and left 1 / 3 and 1 / 3 apples on the third day. How many apples did she buy 2. In a school, the fourth grade is 25% more than the third grade, the fifth grade is 10% less than the fourth grade, and the sixth grade is 10% more than the fifth grade. If the sixth grade has 38 more people than the third grade, how many people are there in the third, fourth, fifth and sixth grades? 3. Vehicle a and vehicle B leave from ab at the same time. After meeting, vehicle B arrives at a in 5 hours. However, vehicle a exceeds B by 90km, 25% of the whole journey
16. Which group of four numbers can make up the proportion? Write out the proportion (1) 1.2, 8, 9 and 60 (2) three fifths, 0.5, 10 and 0.3 (3) 1 / 3, 1 / 6, 1 / 2 and 1 / 9 (4) 4, 12, 5 and 15
17. How to compare the size of two numbers in unit 6 of grade 6 of primary school mathematics
18. 1. Divide the eight numbers 1, 2, 3, 4, 5, 6, 7 and 8 into three groups, and calculate the sum of each group. Given that the three sums are not equal to each other, and the maximum sum is twice the minimum sum, what is the minimum sum? 2. A four digit number is composed of non-zero even digits, which is just the square of the number composed of two even digits? Those who can do more work, those who have nothing to do, please don't talk nonsense!
19. Use 1 / 8,5,1 / 2,20 to form a proportion, and make the ratio of the two ratios equal to 1 / 4. The proportion formula is ()
20. Among the numbers 2, 3, 6, 8 and 16, the proportion of four numbers is ()