Are even numbers greater than 3 and less than 11 a set

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• 1. The set consisting of even numbers greater than - 3 and less than 11 is represented by description as______ ．
• 2. 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
• 3. How to describe a set of all nonnegative even numbers
• 4. 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
• 5. Using descriptive method to express "positive even number set"
• 6. Description of the properties of the set composed of even numbers
• 7. The set of all even numbers is represented by description The answer is {x | x = 2n, n ∈ Z} if n is negative, X is negative, then it is not even
• 8. Set M = {x | 2K π ≤ x ≤ 2K π + π, K belongs to Z} n = {x | - 6 ≤ x ≤ 6} Then the intersection of M and n=
• 9. Given the set M = {x | x = A & # 178; - B & # 178;, a, B ∈ Z}, we prove that if K ∈ Z, then 2K + 1 ∈ M
• 10. We know that M is a set {1, 2, 3 , 2k-1} (K ∈ n *, K ≥ 2), and when x ∈ m, there is 2k-x ∈ M. note that the number of sets m satisfying the condition is f (k), then f (2)=______ ；f（k）=______ ．
• 11. 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}
• 12. The set of even numbers greater than - 3 and less than 11 is {x | - 3
• 13. If M = {x x = 2K + 1, K ∈ Z}, n = {y y = 4N ± 1, n ∈ Z}, try to judge the relationship between M and n
• 14. The relation between set M = {x x = 2K + 1, K ∈ Z} and N = {y y = 4N ± 1, n ∈ Z}
• 15. Let m = {x ｜ x = 2K + 1, K ∈ n +}, n = {x ｜ x = 2k-1, K ∈ n +}, then the relationship between M and N is?
• 16. 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
• 17. 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};
• 18. 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?
• 19. 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
• 20. 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)