The law of exploration: 1,3,5,11,21, (), (), 171341
The nth term of the sequence is denoted as a (n)
a(n)=[2^n+(-1)^(n+1)]/3
Fill in 43 85
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- 1. The combination of interval sequence and equal difference equal ratio mixed sequence, such as: 3,1,5,1,11,1,21,1, (43) How to solve it?
- 2. 3,11,43171683... Is there an analytic expression for this sequence? Wrong. It's the general formula!
- 3. Find sequence 3 / 1 * (2 ^ 2), 5 / (2 ^ 2) * (3 ^ 2), 7 / (3 ^ 2) * (4 ^ 2) The sum of the first n terms of (2n + 1) / A ^ 2 (n + 1) ^ 2
- 4. The number of terms of sequence 5,7,9,11,..., 2N-1 is
- 5. The number of items of 9.11.13.2n-1 is 1. The number of items of 9.11.13... 2N-1 is
- 6. The number of terms of sequence 3,5,9,11..., 2n + 1
- 7. How to find the number of items in a sequence? For example, how to find the number of items in a sequence an = (2n + 1) + (2n-1) + (2n-2) +. + 7 + 5 + 1 There is also a general way to find the number of items in a sequence I'm in the third year of senior high school now. I'm going through the first round of review to find out how to learn
- 8. What is the number of terms of the sequence 1 + 3 + 5 +. + (2n-1)? How to calculate it?
- 9. If 2 and 8 / 21 divided by M = 2 and 1 / 2, then m * 7 / 20=____
- 10. Given that n is a positive integer and (xn) 2 = 9, find the value of (13x3n) 2-3 (x2) 2n
- 11. 1. What is the general term formula for 3; 5; 11; 21; 43; 85; 171?
- 12. Sequence √ 3, 3, √ 15 ,√3(2n-1),…… What is 9?
- 13. Known finite sequence 5,7,9 , 2n + 7 (n is an even number), then 9 + n is the item of the sequence The answer is n / 2 + 3,
- 14. Judge whether 9 is the item in sequence 3 [2n-7]. If so, please indicate which item is it
- 15. Known sequence 3, 9, 15 ,3(2n-1),… So what is 81 () A. 12B. 13C. 14D. 15
- 16. Given the arithmetic sequence 3.7.11.15.195, how many items are there in this sequence
- 17. Given the sequence √ 3, √ 7, √ 11, √ 15,., then 5 √ 3 is its number one?
- 18. (1 + 2 + 3 + 4 +. 2n) / 1 + 3 + 5 + 7 +. 2N-1 = 21 / 10
- 19. Given 8 ^ m = 12,4 ^ n = 6, find the value of 2 ^ (6m-2n + 1)
- 20. Given 8 ^ m = 3,4 ^ n = 6, find the value of 2 ^ 6m + 2n + 1