How many numbers are there that are multiples of both 3 and 5 within 100

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• 1. , fill in 26 27 30 35 () () 1.6.7.12.13
• 2. 1、 Find the rules and fill in the numbers. 12,10,14,13,16,16, [], [], 20,22. What are the rules
• 3. 1,6,7,12,13,18,19, (), ()
• 4. Help me to look at this problem, find the rule 1.6.7.12.13
• 5. Find the rule: 1,1,1.5,3, (), 22.5
• 6. Negative 1.5.22.57 () find the rule and fill in the next number nothing
• 7. Find the rules and fill in the numbers 4,7,13,22,34, (), ()
• 8. -2. - 8, - 18, - 32, - 50, find the rules Please be more specific, Please be more specific. What's the 20th number, how to list the formula, and what are the symbols of *, ^
• 9. 7. 8, 10, (), 22, 38
• 10. 5, 10, 17, 26, 37. What's the process of finding rules?
• 11. What is the multiple of a number? How to find the multiple of six? What are the characteristics of the multiple of a number? What are the characteristics of the multiple of 2, 3, 5, 5?
• 12. A number is not only a multiple of 3 but also a multiple of 6. What is the minimum number? Papers due on Monday
• 13. A number is not only a multiple of 3, but also a multiple of 5 and 7. The minimum number is ()
• 14. Observe the number table and fill in the "mouth" in the number table one 1 -1 1 -2 1 1 -3 3 -1 1 -4 6 -4 1 1-5 port-10 5-1 1-6 ports-20 15-6 1 Why? Why do you fill in this way?
• 15. What is the fifth number in line 10? What is the fifth number in line 200? one 2、3 4、5、6 7、8、9、10 11、12、13、14、15 ……
• 16. According to the following rule, form a number table with positive integers, then which row and number is 2008 in the table 1；2,3；4,5,6；7,8,9,10；………………
• 17. The five numbers are 24:00: 1, 13 7 13 8 29 2, 17 6 30 23 26 3, 14 29 3 6 19 4, 7 19 14 17 21 5, 19 21 23 15 11
• 18. Is the result of 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 +. + 2007 odd or even
• 19. Fill in the number of safety rules: 1 / 2, 8 / 13, 21 / 34, (), (), ()
• 20. Observe the numbers - 1, 2, 7, 14, 23, 34 According to this law, the nth number is______ ．