What is the sum of all elements in the set a = {x ︱ X & # 178; - (a + 2) x + A + 1 = 0, X ∈ r}

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• 1. Given the set a = {a | x = a + X / X & # 178; - 2}, and the set B = {x | x + A / X & # 178; - 2 = 1}, then can the set B be a single element set? If the set a can be represented by enumeration, if not, please explain the reason Set a {- 9 / 4 ± √ 2} I can only answer: - 9 / 4 ± √ 2? I'm really powerless
• 2. Let f (x) = x2 + ax + B, a = {x | f (x) = x} = {a}, and the set composed of elements (a, b) be m
• 3. The set M = {m} composed of the first 2n positive integers belongs to n | 1
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• 5. 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
• 6. Inequality 3x + 6
• 7. 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?
• 8. 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
• 9. 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
• 10. 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
• 11. Let f (x) = x power of 4 divided by (x power of 4 + 2), if 0
• 12. Let f (x-1 / x) = the square of X divided by the fourth power of 1 + X
• 13. If f (x) = (x + a) cubic has f (1 + x) = - f (1-x) for any real number, then f (2) + F (- 2)=
• 14. F (x) = ㏒ {[x power of 1 + 2 + x power of 3 + The x power of + (n-1) + the x power of n × a] / N}, a is a real number , n is any given positive natural number and N ≥ 2, if f (x) is meaningful when x ∈ (- ∞, 1], the value range of a is obtained
• 15. If a ∈ a, then 1 + A1 − a ∈ a, then the product of all elements in a is () A. 1b. - 1C. ± 1D. It is related to the value of A
• 16. Let a be a set of real numbers and satisfy the following conditions: if a belongs to a, then 1 / 1-A belongs to A. prove (1) if 2 belongs to a, then there must be two other elements in a (2) set a can't be a single element set. Thank you very much
• 17. Let the elements of a set be real numbers and satisfy: 1.1 ∈ a; 2. If a ∈ a, then 1 / (1-A) ∈ a (1) If 2 ∈ a, try to find the set a (2) If a ∈ a, try to find the set a (3) Can set a be a single element set? If so, find the set. If not, explain the reason To correct the mistake, the title "1.1 ∈ a" should be "1 &; a".
• 18. If a belongs to real number set and (1-A) / (1 + a) belongs to {a}, then a =?
• 19. Let a be a set of real numbers. If a belongs to a, then 1 / 1-A belongs to a and 1 does not belong to A. It is proved that if a belongs to a, then 1-1 / a belongs to a
• 20. If the set {x | x + a = a | x |, X ∈ r} is a single element set, then the value range of real number a is______ ．