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The intersection of a and B consists of all elements belonging to a and B For "a ∩ B = {x | x ∈ a, and X belongs to B}, we can not only think that any element of a ∩ B is the common element of a and B, but also that the common elements of a and B belong to a ∩ B, which is the meaning of" all "in the text definition, not" part "of the common element, Be clear and easy to understand, When the common elements of a and B are not in a ∩ B? What do you say···
This means that if only any element of a ∩ B is considered to be the common element of a and B, then there may be the case that the common element of a and B is not in a ∩ B, and a ∩ B must be the set of all the common elements of a and B, all the common elements of a and B must be in a ∩ B, and all the elements in a ∩ B must be the common elements of a and B, which are equivalent
The common elements of a and B must be in a ∩ B, which is the definition of intersection
RELATED INFORMATIONS
- 1. If a = {x is greater than or equal to - 3 and less than 1} B = {x is greater than or equal to A-1 and less than or equal to a} and the intersection of a and B is not an empty set, then the value range of a
- 2. Given the complete set L = {x | x ∈ r}, set a = {x, X less than or equal to 1 or X ≥ 3}, set B = {x, K < x < K + 1, K ∈ r} and (C1a) ∩ B = empty set, then the value range of real number k is
- 3. Let a = {2 less than or equal to x less than or equal to 7}, B = {x greater than a}, C = {K + 1 less than or equal to x less than or equal to 2K + 3} 1, if the empty set is a proper subset of (a intersection B), The known set a = {2 less than or equal to x less than 7}, B = {x greater than a}, C = {K + 1 less than or equal to x less than or equal to 2K + 3} 1. If the empty set is a proper subset of (a intersection b), the value range of a is obtained 2. If a and C = a, find the value range of K
- 4. Let u = Z, a = (x | x = 2K -- 1, K belongs to Z) then what is CUA equal to?
- 5. Let u = R, a = {x | 6-x-x ^ 2 > 0}, B = {x | x-4 / x + 3} 1. Find a and B 2. Find a ∩ B, (CUA) ∪ B
- 6. Let a = {x | x = 2k-1, K ∈ Z}, B = {x | x = 2K + 3, K ∈ Z} (2)A={x|x=2k,k∈z｝,B={x|x=-2k,k∈z｝ (2)A={x|x=k+1/4,k∈z｝,B={x|x=k/2-1/4,k∈z｝
- 7. Let a = {x | x = n ^ 2-1, n ∈ Z} B = {x | x = k ^ 2 + 2K, K ∈ Z} if a ∈ a, judge the relationship between a and B
- 8. As shown in the figure, if the line y = KX + B intersects the coordinate axis at a (- 3,0) and B (0,5), then the solution set of inequality - kx-b < 0 is______ ．
- 9. If the two intersections of the line y = KX + B on the coordinate axis are a (2,0) and B (0, - 3), then the solution set of the inequality KX + B ≥ 0 is
- 10. Given that a and B are rational numbers, and the root sign 2A + (root sign 2-1) B = 2 root sign 2a-1, try to find the solution set of inequality - ax & gt; 2B
- 11. What is the intersection of an empty set and a? 1. What is the intersection of an empty set and a (non empty set)? 2. Why {x | x > 2} {x | X2, or x
- 12. If a intersection B equals B, is a equal to B? That is, the intersection of a and B is equal to B. does it mean that set a and B are equal
- 13. A ∪ B = a, then a can be equal to B, the intersection of a and B is equal to B, can a be equal to B
- 14. What does it mean that the intersection of a and B equals the union of a and B?
- 15. Does the intersection of a and B equal a mean that B equals a
- 16. Is the intersection of a and a empty
- 17. If the intersection of a and B is an empty set, then at least one of a and B is an empty set?
- 18. The intersection of a and B is B. can a and B be empty
- 19. Can the intersection of set a and set B be empty? Can it be set a or set B?
- 20. Let u = n, a = {x | x = 2K, K ∈ n}, B = {x | x = 2K + 1. K ∈ n}, find CUA, cub