设全集为R,集合A={x|1<x<5 },B={x|3≤x≤6 }.求:(1)A∩B (2)A∪B (3)CRA∩B (4)CR(A∩B).
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设全集为R,集合A={x|1<x<5 },B={x|3≤x≤6 }.求:(1)A∩B (2)A∪B (3)CRA∩B (4)CR(A∩B). |
答案
(1)∵集合A={x|1<x<5},B={x|3≤x≤6}, ∴A∩B={x|3≤x<5}; (2)∵集合A={x|1<x<5},B={x|3≤x≤6}, ∴A∪B={x|1<x≤6}; (3)∵集合A={x|1<x<5},全集为R, ∴CRA={x|x≤1或x≥5},又B={x|3≤x≤6}, ∴CRA∩B={x|5≤x≤6}; (4)∵A∩B={x|3≤x<5},全集为R, ∴CR(A∩B)={x|x<3或x≥5}. |
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