A set of odd numbers smaller than 1000 in the set of natural numbers

Odd numbers are numbers that cannot be divisible by 2, 2N-1, n = 1-500

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1. It is known that the set s is composed of natural number x satisfying "if x belongs to s, and 8-x = s" 1. If there is only one element in s, then s= 2. If there are only two elements in s, then s = {0,8}
2. If x belongs to s, then 8-x belongs to s If s has two elements, then s=
3. When the elements in the set s are all natural numbers, and satisfy the proposition "if x belongs to s, then 8-x belongs to s", Try to write all of s with 3 elements? My question Why are there three elements? If you take 1, then 8-1 = 7, then 8-7 or return to 1, how can there be three elements?
4. It is known that if x belongs to s, then 6-x belongs to s, the natural number x constitutes the set S1. If s is a set of single elements, then s=__ ,
5. When the elements in the set s are all natural numbers and satisfy the proposition "if x belongs to s, then 8-x belongs to s", how many sets S satisfy the above conditions When the elements in the set s are all natural numbers and satisfy the proposition "if x belongs to s, then 8-x belongs to s", how many sets S satisfy the above conditions, please write them all! I don't know the answer on the first floor
6. Natural number set n positive integer set n + then does n + belong to n
7. Is n a set of natural numbers or a set of positive integers?
8. The elements of set a are natural numbers If x ∈ a, then 4-x ∈ a 1. Write a set a with only one element 2. Write all sets a with 2 elements 3. How many sets a satisfy the condition of question setting
9. How to construct the one to one correspondence between rational number and natural number set
10. 70 is divided into the sum of 11 different natural numbers. How many methods are there? List them one by one
11. N is a natural number, 2n + 1 must be odd______ (judge right or wrong)
12. For natural numbers less than 1000, why should 0 be less than or equal to x less than 1000 in the set composed of odd numbers
13. How to represent the natural numbers in these sets (1) (2) the distance from the plane to a fixed point O is equal to all the points P of the fixed length L (L > 0)
14. Representation of the set of all natural numbers less than 5 by description
15. Using descriptive method to express "a set of all natural numbers greater than 10" as______ ．
16. Decimal natural numbers can be written as polynomials of decreasing power of 2, such as: 19 (10) = 16 + 2 + 1 = 1 × 24 + 0 × 23 + 0 × 22 + 1 × 21 + 1 × 20 = 10011 (2) Decimal natural numbers can be written as polynomials of decreasing power of 2, such as: 19 (10) = 16 + 2 + 1 = 1 × 24 + 0 × 23 + 0 × 22 + 1 × 21 + 1 × 20 = 10011 (2), that is, decimal number 19 corresponds to binary number 10011. According to the above rules, decimal number 353 corresponds to binary number 10011
17. If a natural number is a multiple of 3 and 4, and there are 10 divisors including 1 and itself, then the natural number is______ ．
18. Let n be the nth power of natural number (- 1) + (- 1) n plus 1 power divided by 2 The value might be 0, - 1, which is 1
19. If n is a natural number, then the 2n + 1 power of (- 3) plus the 2n power of 3 (- 3) =?
20. Six cards are written with six different prime numbers. The sum of three fractions made up of these six numbers is a / 1001, where a is a natural number. What is the minimum value of a?