The set of positive integers divided by 5 and 1 is represented by description______ ．

According to the question, let the number be x, then the number x satisfies x = 5N + 1, n ∈ n, and the set of positive integers is {x | x = 5N + 1, n ∈ n} so the answer is: {x | x = 5N + 1, n ∈ n}

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1. To express "a set of positive integers divided by three and remaining one" by descriptive method:______ ．
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3. 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
4. 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
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6. (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
7. Given the set u = {1, 2, 3, 4, 5, 6}, for the set a ⊆ u, define s (a) as the sum of all elements in a, then the sum s of all s (a)=______ ．
8. Given the set a = {0,1,2}, B = {1,2,3,4}, define a + B = {(x, y) | x ∈ a ∩ B, y ∈ a ∪ B}, find the number of elements in a + B Urgent process
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10. Given the set a = {x1,2,3,4,5,6}, for X contained in a, define s (x) as the sum of all elements in this subset x, and find the sum of all s (x) ditto
11. 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
12. Using description method to represent the set a composed of all positive integers divided by 3 and 2=______ ．
13. To express the set of integers divided by 3 and 2 by description
14. Using description method to express the set of numbers divided by 4 and 1
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