How to describe a set of all nonnegative even numbers

A＝｛x|x＝2|k|,k∈Z｝.

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1. 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
2. Using descriptive method to express "positive even number set"
3. Description of the properties of the set composed of even numbers
4. 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
5. 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=
6. Given the set M = {x | x = A & # 178; - B & # 178;, a, B ∈ Z}, we prove that if K ∈ Z, then 2K + 1 ∈ M
7. 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）=______ ．
8. Let m = {x = k π K ∈ Z} n = {x | x = 2K π + - π, K ∈ Z}, then the relation between M and N is When m = 0, n is not equal to 0. Why m = n
9. Set M = {XIX = 2K + 1, K ∈ Z}, n = {XIX = 4K ± 1, K ∈ Z} How to prove n ∈ m? It is said in the book that n ∈ M can be explained in detail because m is an odd number set
10. Given a = {x | x = (2k + 1) π, K ∈ Z},}, B = {x | x = (4k-1) π, K ∈ Z}, then the relation between a and B is
11. 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
12. The set consisting of even numbers greater than - 3 and less than 11 is represented by description as______ ．
13. Are even numbers greater than 3 and less than 11 a set
14. 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}
15. The set of even numbers greater than - 3 and less than 11 is {x | - 3
16. If M = {x x = 2K + 1, K ∈ Z}, n = {y y = 4N ± 1, n ∈ Z}, try to judge the relationship between M and n
17. The relation between set M = {x x = 2K + 1, K ∈ Z} and N = {y y = 4N ± 1, n ∈ Z}
18. Let m = {x ｜ x = 2K + 1, K ∈ n +}, n = {x ｜ x = 2k-1, K ∈ n +}, then the relationship between M and N is?
19. 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
20. 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};