已知集合A={x丨3≤x<7},B={x丨2<x<10},求∁R(A∪B),∁R(A∩B),(∁RA)∩B,A∪(∁RB).
题目
已知集合A={x丨3≤x<7},B={x丨2<x<10},求∁R(A∪B),∁R(A∩B),(∁RA)∩B,A∪(∁RB).
答案
∵集合A={x丨9≤x<l},B={x丨2<x<17},
∴A∪B={x|2<x<17},A∩B={x|9≤x<l},∁RA={x|x<9或x≥l},
∴∁R(A∪B)={x|x≤2或x≥17},
∁R(A∩B)={x|x<9或x≥l},
(∁RA)∩B={x|2<x≤9或l≤x<17}.
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