The general term formula of 2,6,18,54 series?

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• 1. What is the general term formula of sequence 1 / 2, - 1 / 2,5 / 18, - 7 / 54
• 2. A general term formula sequence 2, - 6,18, - 54. A general term formula
• 3. General term formula of sequence 1 / 2,2 / 5,1 / 3,2 / 7
• 4. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162, An = 2 * 3 ^ (n-1), if Sn = 242
• 5. 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
• 6. In the known equal ratio sequence {an}, A2 = 6, A5 = 162, find the first n terms and Sn of the sequence {an}
• 7. 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) let Sn be the sum of the first n terms of the sequence {an}, and prove that Sn · SN + 2s2n + 1 ≤ 1
• 8. In order to know A2 = 6, A5 = 162 in the equal ratio sequence {an}, find the first n terms and Sn of the sequence {an}
• 9. 2、6、18、54、（）、（）
• 10. 9、18、54、5、10、30、7、()、（）
• 11. 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,
• 12. 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?
• 13. 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?
• 14. 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;
• 15. A series of numbers in regular order: 1, 2, 4, 7, 11, 16, 22, 29 The number 1997 of this string is______ ．
• 16. Simple calculation of 0.4 + 0.8 + 1.6 +. + 25.6 + 51.2
• 17. Simple calculation of 0.75 × 25 △ 0.250.51 △ 7.1-0.02
• 18. How to calculate 48 × 48 + 48 × 51 + 48
• 19. Simple calculation of 0.51 △ 1.7 + 0.35 × 0.2
• 20. 51 / 24x43 + 19 / 51x43 is urgent!