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What is the general term formula of sequence 1 / 2, - 1 / 2,5 / 18, - 7 / 54
1/2,-3/6,5/18,-7/54
An= ((-1)^(n-1))*(2n-1)/(2*3^(n-1))
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- 1. A general term formula sequence 2, - 6,18, - 54. A general term formula
- 2. General term formula of sequence 1 / 2,2 / 5,1 / 3,2 / 7
- 3. It is known that the sequence {an} is an equal ratio sequence, A2 = 6, A5 = 162, An = 2 * 3 ^ (n-1), if Sn = 242
- 4. 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
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- 7. 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}
- 8. 2、6、18、54、（）、（）
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- 14. 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?
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- 19. How to calculate 48 × 48 + 48 × 51 + 48
- 20. Simple calculation of 0.51 △ 1.7 + 0.35 × 0.2