![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
In the arithmetic sequence {an}, A6 + A7 + A8 = 75, then A3 + a11 = () A. 48B. 49C. 50D. 51
In the arithmetic sequence {an}, A6 + A7 + A8 = (A6 + A8) + A7 = 3a7 = 75, ∧ A7 = 25, ∧ A3 + a11 = 2a7 = 50
In the arithmetic sequence {an}, A3 + a11 = 40, then the value of A6 + A7 + A8 is ()
A. 48B. 60C. 72D. 84
In ∵ arithmetic sequence {an}, A3 + a11 = 40, ∵ A3 + a11 = 2a7 = 40, that is, a7 = 20, then A6 + A7 + A8 = (A6 + A8) + A7 = 3a7 = 60
In the arithmetic sequence {an}, A3 + a11 = 40, then the value of A6 + A7 + A8 is ()
A. 48B. 60C. 72D. 84
In ∵ arithmetic sequence {an}, A3 + a11 = 40, ∵ A3 + a11 = 2a7 = 40, that is, a7 = 20, then A6 + A7 + A8 = (A6 + A8) + A7 = 3a7 = 60
RELATED INFORMATIONS
- 1. Given that {an} is an arithmetic sequence, A3 + a11 = 41, then a6-a7 + A8 is equal to
- 2. Arithmetic sequence a1 + a3 = 4, A4 + A6 = 12, a8 + A10 =?
- 3. In the arithmetic sequence {an}, A3 + A8 = 12, A6 = 5=
- 4. An is the arithmetic sequence, A3 + A8 = 16, A6 = 7 to find the tolerance D
- 5. In the arithmetic sequence {an}, A3 + a7-a10 If in the arithmetic sequence {an}, A3 + a7-a10 = 8, a11-a4 = 4, then S13 =? Is there any simple method This is in addition to solving A1 and d by two equations, and then substituting them into the summation formula,
- 6. In the arithmetic sequence {an}, 3 (A3 + A5) + 2 (A7 + A10 + A13) = 24, then the sum of the first 13 items in the sequence is () A. 13B. 26C. 52D. 56
- 7. In the known sequence {an}, A3 = 2, a7 = 1. If {1 / an + 1} is an arithmetic sequence, then a11 is equal to?
- 8. In the arithmetic sequence, A2 + A5 = 11, A3 + A6 = 17, find the general formula of {an}
- 9. In the arithmetic sequence {an}, a2-a1 = 8, and A4 is the proportional median of A2 and A3
- 10. When a is not equal to 0, calculate the third power of [(- a) to the second power] and the third power of (- a) to the second power A must be equal, B must not be equal, C may or may not be equal, D is uncertain
- 11. Given the arithmetic sequence {an}, A6 = 5, A3 + A8 = 5, find A9 There is another problem: given the sequence of equal ratio numbers {an}, A6 = 192, a8 = 768, finding S10 requires calculation steps
- 12. Given the arithmetic sequence {an}, and A2 + a3 + A10 + a11 = 48, then A5 + A8=
- 13. In the arithmetic sequence {an}, if S4 = 1, S8 = 4, then the value of A17 + A18 + A19 + A20 is () A. 9B. 12C. 16D. 17
- 14. It is known that {an} is an arithmetic sequence. If a1 + A5 + A9 = 8 π, then the value of COS (A2 + A8) is______ ．
- 15. Arithmetic sequence: a1 + A5 + A9 = 2 π, is the value of COS (A2 + A8) -?
- 16. The summation formula of arithmetic sequence is known in arithmetic sequence {an}, A5 = 6, a8 = 15, A14?
- 17. Given that the sum of the first n terms of the arithmetic sequence {an} is Sn, and S10 = 12, S20 = 17, then S30 is () A. 20B. 15C. 25D. 30
- 18. Let {an} be an arithmetic sequence with a tolerance of - 2 if a1 + A4 + A7 + +A97 = 50, then A3 + A6 + A9 + +A99 equals () A. 82B. -82C. 132D. -132
- 19. Let {an} be an arithmetic sequence with a tolerance of - 2 if a1 + A4 + A7 + +A97 = 50, then A3 + A6 + A9 + +A99 equals () A. 82B. -82C. 132D. -132
- 20. Let the tolerance of the arithmetic sequence an be - 6, and a1 + A4 + A7... + A97 = 50, find the value of A3 + A6 + A9 +... + A99 Come on,