Given that the sequence an is an arithmetic sequence, CN = an ^ 2-A (n + 1) ^ 2 (1) judge whether the sequence cn is an arithmetic sequence, and explain the reason Detailed process

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• 1. Let m = {x ｜ x = 2K + 1, K ∈ n +}, n = {x ｜ x = 2k-1, K ∈ n +}, then the relationship between M and N is?
• 2. The relation between set M = {x x = 2K + 1, K ∈ Z} and N = {y y = 4N ± 1, n ∈ Z}
• 3. If M = {x x = 2K + 1, K ∈ Z}, n = {y y = 4N ± 1, n ∈ Z}, try to judge the relationship between M and n
• 4. The set of even numbers greater than - 3 and less than 11 is {x | - 3
• 5. The set of even numbers greater than - 3 and less than 11 is () A. {x|-3＜x＜11，x∈Q}B. {x|-3＜x＜11}C. {x|-3＜x＜11，x=2k，k∈N}D. {x|-3＜x＜11，x=2k，k∈Z}
• 6. Are even numbers greater than 3 and less than 11 a set
• 7. The set consisting of even numbers greater than - 3 and less than 11 is represented by description as______ ．
• 8. Even number set {x | x = 2K, K belongs to Z} what if k = 0? 0 belongs to integer, so 2K is not equal to 0
• 9. How to describe a set of all nonnegative even numbers
• 10. How to describe the set of all even numbers? A set of all even numbers 1.: {x | x is even} 2.: {x | x = 2n, n belongs to Z} The first one I know is description What's the second one
• 11. It is known that sequence {an} is an arithmetic sequence, CN = an ^ 2-A (n + 1) ^ 2 (n belongs to n *) If a1 + a3 +... + A9 = 30, A2 + A4 +... + A10 = 35-5k (k is a constant), try to write the general term formula of the sequence {CN};
• 12. If the sum of the first k terms of the arithmetic sequence {an} is 30 and the sum of the first 2K terms is 100, then the sum of the first 3K terms of the arithmetic sequence {an} is?
• 13. It is known that {an} is an arithmetic sequence, tolerance D ≠ 0, an ≠ 0 (n ∈ n +), and a (k) x ^ 2 + 2A (K + 1) x + a (K + 2) = 0 (K ∈ n +) (1) Proof: when k takes different natural numbers, the equation has a common root (2) If the roots of different equations are x1, X2 ,Xn,… To prove the sequence 1 / (x1 + 1), 1 / (x2 + 1) ,1/(Xn+1)… Is an arithmetic sequence
• 14. In the sequence {an}, A1 = 0, and for any k ∈ n, a2k-1, a2k, a2k + 1, the tolerance is 2K 0 - 13 days and 2 hours to the end of the problem In the sequence {an}, A1 = 0, and for any k ∈ n, a2k-1, a2k, a2k + 1, the tolerance is 2K. (1) prove that A4, A5, A6 are equal proportion sequence; (2) find the general formula of the sequence {an}. (3) note TN = 2 & sup2 / / A2 + 3 & sup2 / / A3 + +N & sup2 / an proof (3 / 2 < 2n-tn2)
• 15. Is the tolerance of arithmetic sequence 2n, 2m I mean, for example, a function minus another function to get a number like 2n 2m, ask if it's an arithmetic sequence, thank you
• 16. From 1, 2, 3 Any three different numbers in the 20 numbers, 20, are used to form the arithmetic sequence________ Let a, B, C be equal difference, ∵ 2B = a + C, we can know that B is determined by a, C, and ∵ 2b is even number, ∵ a, C are the same odd or even, that is, from 1,3,5 , 19 or 2,4,6,8 In this way, we can determine the arithmetic sequence, C (2,10) * 2 * P (2,2)?
• 17. If the sum of the four numbers of the arithmetic sequence is 52, and the product of the second number and the third number is 160, then the four numbers are in turn RT
• 18. The square of K x + (2k + 1) K + K-2 = 0 is the square of x 1 + x 2 + x 2 = 3 Notice that K times the square of X
• 19. If X1 and X2 are the two real roots of the equation x ^ 2 - (2k + 1) x + K ^ 2 + 1 = 0 about X, and X1 and X2 are greater than 1
• 20. Why is it that {α | α = 120 ° + (2k + 1) · 360 ° K belongs to Z} is not 120 ° at the end edge?