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Number of columns 1, 2, 4, 7, 11, 16, 22, 29 The rule of this series of numbers is that the second number is 1 more than the first number; the third number is 2 more than the second number; the second number is 1 more than the first number;
The difference in the middle is an arithmetic sequence, the formula is an = {[n (n + 1)] / 2} + 1, you can calculate a number
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- 1. A series of numbers 1, 2, 3, 4, 7, 11, 16, 22, 29. The rule of this series of numbers is that the second number is one more than the first number; the number is one more than the first number The fourth number is 3 more than the third number, and so on?
- 2. One column number 1,2,3,7,11,16,22,29 The rule of this series of numbers is that the second number is one more than the first number, The third number is 2 more than the second number, the fourth number is 3 more than the third number, and so on?
- 3. The law of the number in this column is that the second number is one more than the first number, and the third number is one more than the second number More than 2 and so on. What is the remainder of the 1996 number divided by 5 It's also a process,
- 4. The general term formula of 2,6,18,54 series?
- 5. What is the general term formula of sequence 1 / 2, - 1 / 2,5 / 18, - 7 / 54
- 6. A general term formula sequence 2, - 6,18, - 54. A general term formula
- 7. General term formula of sequence 1 / 2,2 / 5,1 / 3,2 / 7
- 8. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162, An = 2 * 3 ^ (n-1), if Sn = 242
- 9. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162 (1) find the general term formula of the sequence {an} (2) if the first term n and Sn of the sequence {an} are more than 50, find the minimum value of n
- 10. In the known equal ratio sequence {an}, A2 = 6, A5 = 162, find the first n terms and Sn of the sequence {an}
- 11. A series of numbers in regular order: 1, 2, 4, 7, 11, 16, 22, 29 The number 1997 of this string is______ ．
- 12. Simple calculation of 0.4 + 0.8 + 1.6 +. + 25.6 + 51.2
- 13. Simple calculation of 0.75 × 25 △ 0.250.51 △ 7.1-0.02
- 14. How to calculate 48 × 48 + 48 × 51 + 48
- 15. Simple calculation of 0.51 △ 1.7 + 0.35 × 0.2
- 16. 51 / 24x43 + 19 / 51x43 is urgent!
- 17. Simple calculation of 7.26 + 8.51 + 38.23 + 0.32 + 8.69
- 18. What are the least common multiples of 51 and 17? What are the least common multiples of 13 and 11? There are also the greatest common factor and the least common multiple of 51 and 34
- 19. The least common multiple of 30 and 40 the least common multiple of 13 and 26 the least common multiple of 51 and 17 The least common multiple of 30 and 40 The least common multiple of 13 and 26 Least common multiple of 51 and 17
- 20. What is the least common multiple of 51 and 36