In the arithmetic sequence {an}, A3 + A8 = 12, A6 = 5=

A3 + A8 = 12, then (a6-3d) + (A6 + 2D) = 12, so 2a6-d = 12, and A6 = 5, so 10-d = 12, d = - 2

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1. An is the arithmetic sequence, A3 + A8 = 16, A6 = 7 to find the tolerance D
2. 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,
3. 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
4. In the known sequence {an}, A3 = 2, a7 = 1. If {1 / an + 1} is an arithmetic sequence, then a11 is equal to?
5. In the arithmetic sequence, A2 + A5 = 11, A3 + A6 = 17, find the general formula of {an}
6. In the arithmetic sequence {an}, a2-a1 = 8, and A4 is the proportional median of A2 and A3
7. 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
8. To solve the equation of X, x square + m times x square + 3x m is not equal to 1
9. Y = (2-x) / [(1-2x) (1 + x)]
10. y=(e^x_ Derivative of e ^ - x) / (e ^ x + e ^ - x)
11. Arithmetic sequence a1 + a3 = 4, A4 + A6 = 12, a8 + A10 =?
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14. 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
15. Given the arithmetic sequence {an}, and A2 + a3 + A10 + a11 = 48, then A5 + A8=
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17. It is known that {an} is an arithmetic sequence. If a1 + A5 + A9 = 8 π, then the value of COS (A2 + A8) is______ ．
18. Arithmetic sequence: a1 + A5 + A9 = 2 π, is the value of COS (A2 + A8) -?
19. The summation formula of arithmetic sequence is known in arithmetic sequence {an}, A5 = 6, a8 = 15, A14?
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