It is known that the tolerance of {an} is 1, and a1 + A2 + +A98 + A99 = 99, then A3 + A6 + A9 + +a96+a99=? 55. I still don't understand.

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• 1. The tolerance of arithmetic sequence an is 1, a1 + A2 + a3 + +A99 = 99, then A3 + A6 + A9 +A96 + A99 =? The answer is 66, RT
• 2. If A1 and A2 are known to be equal difference sequence and A1 = 10, their arithmetic mean is 53.5, then A13 is equal to I figured out 46, but every option was 46 a1 a2 a3 …… A30 is the arithmetic mean of arithmetic difference sequence
• 3. The sum of the first n terms of the arithmetic sequence {an} is Sn = 4n2-25n
• 4. The sum of the first n terms of sequence an is SN. For N, it belongs to positive integer, and (n, Sn) is on the function f (x) = 2x ^ 2-x, Let CN = 2 / Anan + 1, tn be the sum of the first n terms of a sequence, and let tn be
• 5. Let a ≠ 0 and f (x) = a (x ^ + 1) - (2x + 1 / a) have the minimum value - 1, let the first n terms of an and Sn = f (n), let BN = (A2 + A4 +...) +a2n)/n,
• 6. In the arithmetic sequence {an}, if A4 + A8 = 16, then A2 + a10=______ ．
• 7. (x + 1) (x + 2) (x + 3); (x + 19) (x + 20) expansion of the coefficient of the 18th power of X! Super
• 8. Let x obey the exponential distribution with parameter 2, then d (3x) = 36
• 9. There are () rational numbers x that make (x ^ 2 + 3x) ^ 2-2 (x ^ 2 + 3x) - 8 equal to zero A.2 B.3 C.4 D.5
• 10. Using the matrix method, the equations are: 2x1-3x2 + x3-x4 = 33x1 + x2 + X3 + X4 = 0 4x1 - X2 - x3-x4 = 7 - 2x1-x3 + X3 + X4 = - 5
• 11. When n is a natural number, 1, 2, 3, 4 2n denotes______ Number, 2N-1______ Count
• 12. If the first three terms of the arithmetic sequence an are A-1, a + 1 and 2a-3 respectively, then the general term formula of this sequence is?
• 13. Given that the first three terms of the arithmetic sequence are A-1, a + 1 and a + 3, what is the general term formula of the sequence?
• 14. Known sequence 1,5,9 The general formula of 101 is an; arithmetic sequence 3,5,9,15 The general term formula of 105 is BN to find the same term of {an} and {BN}
• 15. It is known that the sum of the first three terms of the arithmetic sequence {an} is - 3, and the product of the first three terms is 8 (1) The general term formula of {an} (2) A3 & # 178; = a2a1, find the sum of the first n terms of the sequence {| a}
• 16. It is known that the sum of the first three terms of the arithmetic sequence {an} is - 3, and the product of the first three terms is 8
• 17. If the quadratic coefficient of X in the product of [x & sup2; - MX + 1] [X-2] is zero, then the value of M is [] Good play + 20
• 18. In the product of (^ 2-mx + 1) (X-2), if the coefficient of two terms of X is 0, then the value of M is zero
• 19. It is known that the factorization result of the quadratic trinomial ax + bx-2 of X is (x + 1) (x-C), and the value of ABC is obtained
• 20. The coefficient of quadratic term of quadratic function f (x) is a. and the solution set of inequality f (x) > 2x is (- 1.3). If f (x) = - 7a has two equal real roots, find the analytic solution of F (x)