5.6.1.0 select two cards to form two digits, which are multiples of 2.3.5 and 2.3

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• 1. Which groups are coprime numbers 6 and 8.4 and 6.10 and 15.15 and 6.12 and 18? If not, what is the least common multiple of each group?
• 2. Here is a set of Coprime numbers: 6 and 9; 8 and 9; 12 and 21; 28 and 32
• 3. The average number of the first group is 12.8, the average number of the second group is 10.2, and the average number of the two groups is 12.02. What is the ratio of the number of the first group to the number of the second group? It's urgent@@@@@@@@@@@@@~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ It's urgent~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I need to explain the process. Excuse me
• 4. Choose five different numbers from the 10 numbers of 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 to form a five digit number, so that it can be divided by 3, 5, 7 and 13. What is the maximum number?
• 5. : (- 0.5) + (+ 1 / 3) + (+ 6.75) + (- 1 / 5)
• 6. -What is 1.53 times 0.75 + 0.53 times three quarters - 3.4 times 0.75
• 7. The ratio of one third of number a to one fourth of number B is 3:0.75, and the simplest ratio of number a to number B is 3:0.75
• 8. Simple calculation of 75 times 23 plus 25 times 23
• 9. In two thirds, three quarters, four fifths, five sixths and six sevens, what is the ratio of the minimum to the maximum?
• 10. It is known that a multiplied by two-thirds equals B multiplied by three-quarters, and four fifths of B equals C multiplied by five sixths (a, B, C are not zero), then a: C equals?:
• 11. Please take six different natural numbers at the same time, so that they meet the following requirements: (1) any two of the six numbers are mutually prime; (2) the sum of any two, three, four, five and six of the six numbers are composite numbers, and briefly explain the reasons why the selected numbers meet the conditions
• 12. From 1, 2, 3, 4 Take any 26 numbers out of the 50 numbers, 49 and 50, then at least two of the 26 numbers are coprime. Q: why?
• 13. In the 72 numbers of 1-72, how many are coprime numbers with 72
• 14. How many pairs of Coprime are there in 4, 3, 7, 9?
• 15. How to do 45 times 12 plus 12 times 58 minus 3 times 3 times 4 in a simple way?
• 16. 66、58、49、59、51、42、52（）（）（）（）
• 17. Simple calculation of 34.5 times 8.23 minus 34.5 plus 27.7 times 3.45 by operation law
• 18. Formula 1 + 2x3 + 4x5 + 6x7 + +The parity of sum of 100x101 is ()
• 19. Please add brackets to the wrong formula: 1 + 2x3 + 4x5 + 6x7 + 8x9 = 479 to make the formula hold positive solution: ()
• 20. In the equation 3 times () - 2 times () = 40, fill in a number in the two brackets, so that the two numbers are opposite to each other, and the equation holds, then what is the number filled in the first bracket?