![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
If M = {1, m}, n = {2,4}, if M and N = {1,2,4}, then the number of values of real number m is
M = 2 or 4
The number is two
5 (2). Known set a = {1, m}, B {n | n ^ 2-3n
The intersection of a and B is contained in B
Then a belongs to B
m²-3m≤0
0≤m≤3
M is not equal to 1
So m = 0,2,3
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 value range of real number a is ()
A. a≥4B. a≤4C. a＞4D. a＜4
In order to make the function y = LG (4-x) meaningful, then 4-x ＞ 0, that is, X ＜ 4, ｜ a = {x | x ＜ 4}, ∵ P: "x ∈ a" is a sufficient and unnecessary condition for Q: "x ∈ B", "a ⊊ B, that is, a ＞ 4
RELATED INFORMATIONS
- 1. It is known that the domain of the function y = LG (4-x) is a, and the set B = {x | x ﹤ a}, if P: X ﹤ 8364; a is a sufficient and unnecessary domain of Q: X ﹤ 8364; B Find the value range of a
- 2. Let P.Q be two nonempty sets of real numbers. Define P + q = {x = │ x = - A + B, a ∈ P, B ∈ Q} if P = {0,1,2} Let P.Q be two nonempty sets of real numbers, and define P + q = {x = │ x = - A + B, a ∈ P, B ∈ Q}. If P = {0,1,2}, q = {- 1,1,6}, the sum of all elements of P + Q is -- Is it to calculate the elements one by one and then sum them up? Is there a simpler way?
- 3. Can we say that the set of all real roots of the equation x ^ 2-2x + 1 = 0 is {1,1}
- 4. According to the first letter given, fill in the blanks with the appropriate words He must be k__ !I can't believe what he said. Parents in the rural a__ seem to support it.
- 5. The seventh letter of English word a is L
- 6. The first letter of three English words is t and the last letter is r
- 7. What's the last letter R and the third letter G? It's five letters
- 8. Five letters, the second letter is h, the fifth letter is e, what is the word
- 9. e. H, a and B are both a letter and a word. Why
- 10. What are the seven letter words that start with s and end with n
- 11. Given that real numbers x and y satisfy y = √ (the square of 3-x), we can find the range of (y + 1) / (x + 3) and (2x + 2Y)
- 12. If three points P (1,1) a (2, - 4) B (x, - 9) are collinear, then x=___ ?
- 13. Let F: X → - x2 + 2x be the mapping from real number set M to real number set n Let F: X → - x2 + 2x be the mapping from real number set M to real number set n. M = n = R, if for real number P ∈ n, there is no corresponding element in M, then the value range of P is determined
- 14. If a and B are real numbers, prove that a ^ 2 + B ^ 2 is greater than or equal to 1 / 2 (a + b) ^ 2
- 15. We know that a and B are positive real numbers, and a + B = 1, and prove that: [1 + 1 / (a ^ 2)] [1 + 1 / (b ^ 2)] is greater than or equal to 25 fast
- 16. Given that real numbers a and B satisfy a > b, prove: - A ^ 2-A < - B ^ 3-b
- 17. Given a, B, x, y ∈ positive real number, prove (a ^ 2) / x + (b ^ 2) / Y ≥ (a + b) ^ 2 / (x + y)
- 18. a. B is a real number if a After my research, I get a more appropriate answer Let a and B multiply by an integer m to make am + 2
- 19. It is known that a and B are positive real numbers, and it is proved that (a + 1 / b) (B + 1 / b) ≥ 4
- 20. An algorithm for comparing the sizes of two real numbers a and B is as follows: ditto