Using description method to express the set of numbers divided by 4 and 1

{x|x=4n+1,n∈Z}

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1. To express the set of integers divided by 3 and 2 by description
2. Using description method to represent the set a composed of all positive integers divided by 3 and 2=______ ．
3. A set of all positive integers divided by 5 and 1? The answer is {x ∈ n | x = 5K + 1, K ∈ n} Why should we explain the condition of K? Just explain the condition of element x? But the answer is not
4. The set of positive integers divided by 5 and 1 is represented by description______ ．
5. To express "a set of positive integers divided by three and remaining one" by descriptive method:______ ．
6. A set of all positive integers divided by 3 and 2 The answer is {X / x = 3K + 2, K ∈ n}, but why K ∈ n instead of X ∈ n? Is it OK to use x ∈ n? But when k = 0, it doesn't seem to meet the conditions
7. Let a = {(x, y) | x ^ 2 / 4 + y ^ 2 / 16 = 1}, B = {(x, y) | y = 3 ^ x}, then the number of subsets of a ∩ B is But there are only two intersections in the image. Why square? There are only two coordinate points. I'm stuck here
8. Let a = {(x, y) | x ^ 2 / 4 + y ^ 2 / 16 = 1}, B = {(x, y) | y = 3 ^ x}, then a intersects B to get the number of subsets
9. Let a = {(x, y) | x24 + y216 = 1}, B = {(x, y) | y = 3x}, then the number of subsets of a ∩ B is () A. 4B. 3C. 2D. 1
10. (2010 the first mock exam in Fengxian District) sets A={(x, y) |x24 +y216=1}, B={(x, y) |y=ax, a > 0, a a, then the number of subset of the subgroup is () A. 2B. 3C. 4D. 1
11. If x ∈ m, then 1 / 1-x ∈ m, then when 4 ∈ m, the product of all elements of M is equal to
12. If we know that set a satisfies the following conditions: when p ∈ a, there is always (- 1 / P + 1) ∈ A. if we know that 2 belongs to a, then the product of all elements in set a is equal to
13. Let a be a nonempty subset of an integer set. For K ∈ a, if k-1 ∉ A and K + 1 ∉ a, then K is said to be a "good element" of A. given s = {1, 2, 3, 4, 5, 6, 7, 8}, all the sets composed of three elements of s have () A. 6 B. 12 C. 9 D. 5
14. The number of sets satisfying that the sum of elements is equal to the product of elements If a set element belongs to a positive integer, find the number of all sets that satisfy that the sum of elements is equal to the product of elements
15. A is a set composed of non negative integer arrays less than 5, and B is a set composed of non positive integers greater than - 4. Does the same number exist in set a and set B A is 0,1,2,3,4 B is - 3, - 2, - 1,0 The same number is 0 That's what I did, but the teacher said it was wrong If not, I will ask the teacher tomorrow
16. For a given positive integer n (n ≥ 6), set a is composed of the sum of five consecutive positive integers not greater than N, and set B is composed of the sum of six consecutive positive integers not greater than n If the number of elements of a ∩ B is 2013, then the maximum value of n is?
17. Inequality 3x + 6
18. Known sets {1,2}, {3,4,5,6,}, {7,8,9,10,11,12,13,14} Where the nth set consists of 2 ^ n consecutive positive integers, and each The largest number in the set and the smallest book in the next set are continuous integers. It is known that the largest number in the nth set is an (1) Finding an expression (2) If the sequence {BN} satisfies BN = [2 ^ (n + 1)] / [an * a (n + 1)], and a
19. A set of all positive integers less than 5
20. The set M = {m} composed of the first 2n positive integers belongs to n | 1