Known sequence: 1, (1 + 1 / 2), (1 + 1 / 2 + 1 / 4), (1 + 1 / 2 + 1 / 4 + 1 / 8) （1+1/2+1/4+…… 1 / {2 Λ n – 1}). Find the sum of its first n terms

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• 1. There is a sequence: 1 / 1,2 / 1,1 / 2,3 / 1,2 / 2,1 / 3,4 / 1,3 / 2,2 / 3,1 / 4 What is the column 7 / 19?
• 2. Is the sum of the first n items of sequence 1 - A ^ 2 - A ^ 3? Sequence 1 - A ^ 2 - A ^ 3 What is the sum of the first n items?
• 3. Sequence 1 / 1,1 / 2,2 / 1,1 / 3,2 / 2,3 / 1,1 / 4,2 / 3,2 / 3,4 / 1 Item 2003 The teacher's answer is 50 / 14. I made 50 / 13 myself. Please come and see how much it is,
• 4. Sequence 1. - 2,3, - 4 ,99,-100,… What are the top 200 items and?
• 5. In the sequence 1 / 2,1 / 3,2 / 3,1 / 4,2 / 4,3 / 4,1 / 5 What is 78 / 99? Find the sum of the first 100 items
• 6. Sequence 1 + 1 / (1 * 2) + 1 / (2 * 3) + ··· + 1 / (99 + 100)= 1/(99*100)
• 7. Sequence 1, - A, a ^ 2, - A ^ 3 The sum of the first n items of is
• 8. Sequence 1, a ^ 2, a ^ 3 The sum of the first n terms of a ^ (n-1)
• 9. Find the sequence of 1 × 2 / 6, 2 × 3 / 6, 3 × 4 / 6 The sum of the first n terms of n × n + 1 / 6
• 10. Fill in the numbers 4,12,24,40, ()
• 11. Seeking sequence: 1, 3 / 4, 5 / 8 What is item 100 of If you find the sequence: 1, 3 / 4, 5 / 8, 13 / 24 What's item 100?
• 12. There is a sequence: 1,2,2,4,3,8,4,16,5... Then its 100th term is
• 13. A general term of sequence 1,2,4,7,11
• 14. Find sequence 1, 2, 4, 7, 11, 16 The general term formula of
• 15. In the following regular sequence, the nth number is (). 1, 4, 9, 16, 25
• 16. There is a sequence 1 - 2 - 3 4 - 5 - 6 7 - 8 - 9 10 - 11 - 12 13?
• 17. At 1, 4, 9, 16, 25 What is the nth number in the regular sequence
• 18. 1,3 / 6,3 / 4,7 / 10,2 / 3,9 / 14,
• 19. I would like to ask prawn: for the sequence 1,2,4,7,11,16,22,29 --- how to find the sum of the first n terms?
• 20. Sequence 1,3,4,7,1,8,9,7, (). 3.9... What are the rules of this sequence