Given the set a = {x | x ≥ 4}, the domain of G (x) = 1 / √ 1-x + A is B. If a ∩ B = empty set;, what is the range of real number a?

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• 1. Let P and Q be two nonempty sets of real numbers. Define the set M = P + q = {a + B | a ∈ P, B ∈ Q}. If P = {0,2,5}, q = {1,2,6}, what is the number of subsets of M
• 2. Let P and Q be two nonempty sets of real numbers. Define the set P · q = {z1z = AB, a belongs to P, B belongs to Q} If P = {- 1,0,1}, q = {- 2,2}, then the elements in the set P · Q are?
• 3. It is proved that if a and B are nonnegative real numbers, then a + B + 2 ≥ 2 (√ a + b)
• 4. Is the true number in logarithmic function a positive real number that is not 1?
• 5. A set of all real roots of the equation x (x ^ 2-2x-3) = 0 How can I solve this equation?
• 6. Use enumeration to represent the following set: the square of equation x is equal to the square of X, so why is there no negative one in the set of real number roots It turns out that the square of X is in brackets
• 7. Choose the appropriate method to represent the following set: (1) the set composed of all real number roots of the equation x (x2-2x-3) = 0; (2) rational numbers greater than 2 and less than 6; (3) the set composed of points on the line y = - x + 4 whose abscissa and ordinate are natural numbers
• 8. If x belongs to {- 1,1,2, the square of X - 2x}, then the set of real numbers x is
• 9. Seven letter English words Guess a word. The last two of the seven letters are bound vernacular, er wa Please answer
• 10. In Grade 9, complete 7 sentences according to the initial 1.It's n____ for us to learn knowledge as much as possible. 2.They are going to p____ their piano concert tonight. 3.At last,they s____ in finishing that hard work. 4.This restaurant is too small to s___ so many people.Let 's go to another one. 5.Liu Xiang's success is an i___ to us all. 6.Whenever I am in trouble,my friend Mary always o___ to help. 7.The fire began at eight and soon it was out of _____ (control) Answer as many as you can
• 11. Let P and Q be two nonempty sets of real numbers, and define the set P + q = {a + B | a ∈ P, B ∈ Q}. If P = {0, 2, 5}, q = {1, 2, 6}, then the number of elements in P + Q is () A. 6B. 7C. 8D. 9
• 12. It is known that the definition field of function y = LG (4-x) is a, and set B = {x | x ＜ a}. If P: "x ∈ a" is a sufficient and unnecessary condition of Q: "x ∈ B", then the real number a Why is it greater than 4 instead of less than 4? Isn't the sufficient and unnecessary condition that a can deduce B, but B can't deduce a
• 13. Given the set a = {0.1.2}. B = {1. M} if a ∩ B = B, what is the direct of real number m Come back quickly
• 14. Let a = {- 1, 0, 3}, B = {a + 2, A2-1}, a ∩ B = {3}, then the value of real number a is______ ．
• 15. Given the set a =, B =, and the intersection of a and B =, then the real number a=
• 16. If a set a = {1, m, - 2} B = {- 1.2.4} and a intersects B = {2}, then the value of real number m is
• 17. Let a = {- 1, 1, 3}, B = {a + 2, A2 + 2}, a ∩ B = {3}, then the value of real number a is______ ．
• 18. It is known that real numbers a, B and C satisfy the following conditions: a = x squared - 2Y + π / 2, B = y squared - 2x + π / 3, C = Z squared - 2x + π / 6 Verification: at least one of a, B, C is greater than 0
• 19. Given the real number a + B + C = 3, and a square + 2 (b square) + 3 (C Square) = 5, find the maximum value of A
• 20. When the value of real number a is (a-3a + 2) x + (A-1) x + 2 > 0, it is always true for any X