If a set a = {1, m, - 2} B = {- 1.2.4} and a intersects B = {2}, then the value of real number m is

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• 1. Given the set a =, B =, and the intersection of a and B =, then the real number a=
• 2. Let a = {- 1, 0, 3}, B = {a + 2, A2-1}, a ∩ B = {3}, then the value of real number a is______ ．
• 3. 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
• 4. 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
• 5. 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
• 6. 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?
• 7. 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
• 8. 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?
• 9. It is proved that if a and B are nonnegative real numbers, then a + B + 2 ≥ 2 (√ a + b)
• 10. Is the true number in logarithmic function a positive real number that is not 1?
• 11. Let a = {- 1, 1, 3}, B = {a + 2, A2 + 2}, a ∩ B = {3}, then the value of real number a is______ ．
• 12. 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
• 13. Given the real number a + B + C = 3, and a square + 2 (b square) + 3 (C Square) = 5, find the maximum value of A
• 14. When the value of real number a is (a-3a + 2) x + (A-1) x + 2 > 0, it is always true for any X
• 15. In the plane, if three points P (1,1), a (2, - 4), B (X-9) are collinear, then the value of real number x is () A.-1 B.3 C.9/2 D.51
• 16. If 2A = 3B = m and 1A + 1b = 2, then the value of real number m is () A. 6B. 16C. 6D. ±6
• 17. If a + B = 1, a and B are all positive real numbers, prove: (a + 1 / a) ^ 2 + (B + 1 / b) ^ 2 > = 25 / 2
• 18. Let a, B ∈ R, and a + B = 1. Prove: (a + 2) 2 + (B + 2) 2 ≥ 252
• 19. Let a, B ∈ positive real number, and a + B = 1, the proof is greater than or equal to 25 / 4
• 20. We know that a and B are real numbers, and 2 ^ A + 3 ^ b > 2 ^ (- b) + 3 (- a), and prove that a + b > 0