x. Y is a real number P: X ＞ Y Q: | x | y|

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• 1. In the set of real numbers a, - A, | a |, the elements are
• 2. X y is a real number and X & # 178; - 2x + √ XY-2 = - 1, find the value of 1 / XY + 1 / (x + 1) (y + 1) +. + 1 / (x + 2006) (y + 2006) Sorry for the inconvenience
• 3. All the solutions of the equation y = x & # 178; + 1
• 4. The set of composition of real number solutions of equation x2-2 = 0
• 5. Is the real solution of equation x2 + 2 = 0 a set?
• 6. The set of all real roots of the equation x ^ 2-2 = 0 The set of all real roots of the procedure x ^ 2-2 = 0 Let the real root of the equation x ^ 2-2 = 0 be x and satisfy the condition x ^ 2-2 = 0. Therefore, it is expressed as a = {x ∈ R I x ^ 2-2 = 0} What do you mean "and satisfy the condition x ^ 2-2 = 0"? Can r use other common number sets, such as Q or Z
• 7. 1. Choose an appropriate method to represent the set clique which is composed of all the real roots of the equation x & # 178; - 2x-3 = 0. The answer is {3.0-1} why has 0? 2. There are 8 proper subsets of set {1,2,3}. Please list them! The second question is wrong, there should be 8, which 8? Not which 6!
• 8. The set of all real roots of the equation x & sup2; = x How to solve the equation x & sup2; = x is to write out the steps! Why a 0, a 1?
• 9. The set of real number solutions of equation x ^ 2-x = 2
• 10. The set of real solutions of the equation X-2 = 0,
• 11. Let a = {the square of X / x-3x + 2 = 0}, B = {the square of X / x + 2 (a + 1) x + (the square of a-5) = 0. If AUB = a, find the value range of real number a? Complete solution steps, at least I can understand! The answer is given, where △ is the square of 4 (a + 1) - 4 (the square of a - 5) = 8 (a + 3); how did it come from? Why do we have to use it to judge? This △ = 4 (a + 1) square-4 (A's square-5) = 8 (a + 3); how can we get it? Or is there a dead formula for such a similar problem, as long as it's hard? Sorry, it's a bit stupid @!
• 12. If a √ a + B √ B ＞ a √ B + B √ a, then the condition that real numbers a and B should satisfy is? If a √ a + B √ B ＞ a √ B + B √ a, then the condition that real numbers a and B should satisfy is?
• 13. High school mathematics problem: determine that the equation (X-2) (X-5) = 1 has two different real number solutions, and one is greater than 5, one is less than 2
• 14. Given the mapping f a → B, a = b = R, the corresponding rule is: X → y = - x2 + 2x, for the real number k belongs to B, there is no original image in a, find K Come on, see who can write it
• 15. Given that the equation AX ^ 2 + BX-1 = 0 (AB belongs to R and a > 0) has two real roots, one of which is in the interval (1,2), what is the value range of A-B The answer is (- 1, positive infinity). I want a simple and understandable solution
• 16. 1. If the univariate quadratic equation x2 + ax + 1 ≥ 0 holds for all real numbers x, find the value range of real number A. (what is △ at this time?) For all real numbers x, the inequality AX2 + 4x + a ＞ 1-2x2 holds, and the value range of real number a is obtained Ask specific process.. the teacher did not speak carefully And when △ why is constant established? Is constant meaningful?
• 17. Inequality ax ^ 2 + ax + A-1 I think we should discuss the scope of X
• 18. Let a = {(x, y) | y = 2x-1, X ∈ n *}, B = {(x, y) | y = AX2 ax + A, X ∈ n *}, ask whether there is a non-zero integer a, so that a ∩ B ≠? If it exists, request the value of a; if it does not exist, explain the reason
• 19. Let a = {(x, y) | y = 2x-1, X ∈ positive natural number}, B = {(x, y) | y = ax ^ 2-ax + A, X ∈ positive natural number}, ask whether there is a non-zero real number a, let a ∩ B be If there is a single element set, find out the value of A. if not, explain the reason
• 20. Proof: the equation AX ^ 2 + 2x + 1 = 0 of X has at least one negative root if and only if a