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=__ ,

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• 1. 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
• 2. Natural number set n positive integer set n + then does n + belong to n
• 3. Is n a set of natural numbers or a set of positive integers?
• 4. 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
• 5. How to construct the one to one correspondence between rational number and natural number set
• 6. 70 is divided into the sum of 11 different natural numbers. How many methods are there? List them one by one
• 7. There is a natural number with two digits. Three times the sum of the two digits is exactly the natural number. Find the natural number
• 8. What are natural number set, rational number set and real number set?
• 9. What are natural number sets, rational number sets, real number sets, and how many number sets are there
• 10. The proof of the equality of cardinal number between algebraic number set and natural number set Don't prove that the set of rational numbers is countable there Let's not just say that algebraic numbers are countable because equations are countable
• 11. 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?
• 12. If x belongs to s, then 8-x belongs to s If s has two elements, then s=
• 13. 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}
• 14. A set of odd numbers smaller than 1000 in the set of natural numbers
• 15. N is a natural number, 2n + 1 must be odd______ (judge right or wrong)
• 16. 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
• 17. 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)
• 18. Representation of the set of all natural numbers less than 5 by description
• 19. Using descriptive method to express "a set of all natural numbers greater than 10" as______ ．
• 20. 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