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 | Math enthusiast | Mathematical art

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

This is the set of real numbers set a, which is the set of real numbers set a condition: if a ∈ a, then 1 + A1 {a, then 1 + A1 {A1} a, and {1 + 1 + 1 + 1 + 1 + A1 {A1 {A1} A1 {A1} set a, then 1 + A1 {a \\all1 + 1 + 1 + 1 + 1 + 1 + A1 {A1} {A1 {A1 {A1 {A1 {A1 {1A} 1a {1a, A1 {1a {A1 {1a {1a, all this is the set a, and this is the set a, the set a, the set a is the set a, the set a of the set a is all all, the set a is all of this this this this this this, the set a, the set a, the set a is the set a A1 − a) = 1, so select a

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1. 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
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3. Let f (x-1 / x) = the square of X divided by the fourth power of 1 + X
4. Let f (x) = x power of 4 divided by (x power of 4 + 2), if 0
5. What is the sum of all elements in the set a = {x ︱ X & # 178; - (a + 2) x + A + 1 = 0, X ∈ r}
6. 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
7. Let f (x) = x2 + ax + B, a = {x | f (x) = x} = {a}, and the set composed of elements (a, b) be m
8. The set M = {m} composed of the first 2n positive integers belongs to n | 1
9. A set of all positive integers less than 5
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11. 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
12. 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".
13. If a belongs to real number set and (1-A) / (1 + a) belongs to {a}, then a =?
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20. The set of real solutions of the equation X-2 = 0,