Let u = Z, a = {x = 2K, K ∈ Z}, B = {x | x = 2K + 1, K ∈ Z} CUA, Cub? Write the steps?

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• 1. Let a = {x x = 2k-1, K ∈ Z}, B = {x x = 2K, K ∈ Z}, find a ∩ B, find a ∪ B
• 2. Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? Let u = Z, a = {x | x = 2K, K ∈ Z}; b = {x | x = 2K + 1, K ∈ Z} find CUA, Cub? It's urgent
• 3. When u = Z, a =, B = find CUA, cub
• 4. Let u = Z, a = {x | x + 2K, K ∈ Z}, B = {x | x = 2K + 1, K ∈ Z}, find CUA, cub
• 5. Let u = n, a = {x | x = 2K, K ∈ n}, B = {x | x = 2K + 1. K ∈ n}, find CUA, cub
• 6. Can the intersection of set a and set B be empty? Can it be set a or set B?
• 7. The intersection of a and B is B. can a and B be empty
• 8. If the intersection of a and B is an empty set, then at least one of a and B is an empty set?
• 9. Is the intersection of a and a empty
• 10. Does the intersection of a and B equal a mean that B equals a
• 11. It is known that two points a and B are on the straight line y = X-1, and the difference between the abscissa of a and B is the root sign 2 Be as detailed as possible
• 12. If a + B = 4 radical a + 2 radical B-5, then a + 2B= The faster the better, small points do not become respect!
• 13. （√3+√2）^-1+ √（-2）+3 √-8 The number of positive solutions of inequality 2x-1 < 3 is If x ＜ m + 1 If x ＞ 2m-1, the value range of M is
• 14. Given the module of vector a = 4, the module of B = 3, < A, b > = 3 / 3, find the module of (3a + 2b) & _; B, a + B If the module of vector a = 4, the module of B = 3, < A, b > = 3 / 3, find （3a+2b)•b Modules of a + B Modules of A-B
• 15. Given two points a (1,2,1), B (2, - 1,3), try to find the modulus and direction cosine of vector ab
• 16. Three points a (2,4) and B (0, negative 3) C and (5,1), find the cosine value of the angle between the vector AB and AC
• 17. 9. Given two points a (2,0,3) and B (1,2,4), the module, direction cosine and direction angle of vector AB are calculated
• 18. Given the vector a = (x, - 1), B = (2,2), A.B = 0, then 2a-3b =?
• 19. Finding (2a + axb-3b) x (- a) with the module of vector a * b = 2. A as 1
• 20. The following is the schematic diagram of 200m runway, with its end point and starting point on the straight track. As the middle of the runway bypasses the semicircle, the starting point of the outer runway should be moved forward. If each runway is 1.2m wide, how many meters should the starting point of the outer runway be moved forward? (accurate to 0.1M)