1. Set 0

Because x (n) = a ^ n, 0 >Because f (x) + F (y) = f (x + y) - XY-1 and f (1) = 1, now take x = 1, y = n-1, then 1 + F (n-1) = f (n) - (n-1) - 1 = f (n) - N, then f (n) - f (n-1) = n + 1. If f (n) = n, then f (n) = 0.5N ^ 2 + 1.5n-1

RELATED INFORMATIONS

1. The sequence of 1,2,6,24120 Urgent request Normal, no n!
2. Write the general formula (1) 3,5,9,17,33 （2）0,3,—8,15,—24,… （3）6,66,666,6666,…
3. Must the sequence be arranged regularly?
4. In the sequence of numbers, must the arrangement of numbers be regular? For example, is sequence 1,2,5,9,5,3,7,2,4,5,7 a sequence?
5. The sequence 3,2,3,7,18, (), has 47,24,36,70
6. Sequence. 4,13,36, (), 268 what do you fill in the brackets? 4,13,36,( ),268 A.97 B.81 C.126 D.179
7. How to calculate 58.36 × 0.5 18.2
8. 0.15 equals (): () equals 30 divided by () equals 15%
9. Reduce 8 / 36, 27 / 6, 30 / 57 / 63 to the simplest score
10. 6-32-76-1312-2120-3130= ___ ．
11. In an equal ratio sequence, if the first term = common ratio, then A. When | Q | 1, Liman = 0 B. When | Q | 1, Liman = 0
12. Solving: multiple choice questions about the definition of sequence limit The convergence of sequence {xn} to real number a is equivalent to () For any given E > 0, a has an infinite number of sequences in (A-E, a + e) For any given E > 0, B has finite multinomial with sequence in (A-E, a + e) For any given E > 0, C has an infinite number of sequences outside (A-E, a + e) For any given E > 0, D has finite multinomial with sequence outside (A-E, a + e) I think it's all infinite. I don't understand, I just don't know why it's d
13. The general term formula of + 1, - 8 / 5, + 15 / 7, - 24 / 9 Finding the general term formula of sequence 1,2,2,4,3,8,4,16,5 and +The general formula of 1, - 8 / 5, + 15 / 7, - 24 / 9 By the way, give me some ideas,
14. 14, 15, 16, 17, 21, 20, 19, 18, 22, 23, 24, 25, when the row reaches 200, in which row, in which column? When the row reaches 3211? 22,23,24,25, 29, 28, 27, 26 go on
15. The first n terms and Sn of sequence 3 / 2,5 / 4,9 / 8,17 / 16, ·· (2 ^ n) + 1 / 2 ^ n It seems that we are going to use some kind of dislocation subtraction
16. Find sequence 1 / 2, 3 / 4, 5 / 8, 16 / 17 The sum of the first n terms of 2N-1 / 2 ^ n A problem in the summation of sequence
17. 2. 5, 10, 17, 26, 37, 50. What is the 100th number of the sequence
18. How to answer 5.17.21.25
19. What's the rule of 5 4 12 17.5 24 sequence! Find the last five numbers. Find the average of the last 10 numbers I don't know the rules of these five numbers!
20. Finding the law of sequence 2 2 4 6 8 find the law, why, please specify