Use the three numbers 2, 4 and 8, and then add a () or () or () to form a proportion. Write the proportion with the largest ratio

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• 1. The ratio of these four numbers is () A.15 to 3 equals 5 to 9 B.3 to 15 equals 9 to 5 c.15 to 9 equals 5 to 3
• 2. Formula: there are () numbers that can be proportional to 3, 4 and 6, the largest of which is (). How to write the formula? There are () numbers that can be proportional to 3, 4 and 6, the largest of which is ()
• 3. Judge the proportion of the four numbers in the following group and write down the proportion 0.2,0.8,4,0.4 2/3,1/3,1/10,1/5 1.5,1/4,1,6 3,5,8,4 3/8,5/8,6,10 1.6,6.4,2,5 A few write a few
• 4. What are the methods to judge whether the four numbers are proportional
• 5. Among the ten numbers from 0 to 9, choose any four numbers to form the maximum number and the minimum number. For example, choose 1, 3, 7 and 8, and the maximum number is 8731 The smallest number is 1378. Then subtract the two numbers, and recombine the four numbers of the result into a maximum number and a minimum number, and subtract them again. "8731-1378 = 73537533-3357 = 4176" in this repeated process, can you find a mysterious number?
• 6. Only use 2, 3, 4 and 5 to form a number. Each number can only be used once. What's 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.) The biggest number I think of is 2 ^ (3 ^ (4 ^ 5)). Is this the biggest? Is there any bigger one?
• 7. 2. Three, four, five four numbers, constitute a number, each number can be used once, to find the largest number? You can use power calculation, such as the 54th power of 23
• 8. Can the four numbers 2, 3, 2.5 and 4 form a proportion? Why?
• 9. Write a maximum number with 4, 4 and 4 without any operation symbol
• 10. Use the number 012345 to form a number without repeating numbers, and find the sum of three digits of all components
• 11. The charge standard of a city's internal telephone is: 0.2 yuan for the first three minutes (less than 3 minutes is calculated as 3 minutes), and 0.1 yuan for every one minute after that; the charge standard of long-distance telephone is: 0.08 yuan for every 10 seconds (less than 10 seconds is calculated as 10 hours). Xiao Ming made several calls one day continuously, and paid 2.04 yuan in total. How many minutes did Xiao Ming make the most calls
• 12. Say what each step is Mr. Liu took 1100 yuan from the bank. There are two denominations of 100 yuan and 50 yuan. Among them, the number of 100 yuan is 3 / 5 of 50 yuan? Kneel down!
• 13. Number theory in grade six of primary school The 999 numbers of 1234... 999 are evenly arranged in a big circle, counting from 1: cross out 23 every 1, cross out 56 every 4... So cross out two numbers every other number, and circle them. Question: which number is left? Why? Process
• 14. >How to compare the size of two numbers_ Primary school mathematics: the order of numbers and comparative size
• 15. The two passenger and freight cars of Party A and Party B start at the same time. When they meet, the distance ratio of the two cars is 6:5. After meeting, the freight car is 12 kilometers faster than the passenger car per hour. At last, the two cars arrive at the other side's starting point at the same time. It takes 12 hours for the freight car to complete the whole journey. How many kilometers is the distance between Party A and Party B?
• 16. Choose four numbers from 1, 2, 4, 8 and 16 to form a proportion. How many can be grouped
• 17. Add a number to the three numbers 12, 8 and 6 to form a proportion. The number may be (), () or ()
• 18. 2,3,8 and () can form proportions. 1,22,53,12
• 19. 2:4 And 0.4:0.8
• 20. Use 2,16,4,8 to form four different proportions