问题
解答题
已知全集U={1,2,3,4,5,6,7,8,},A=x|x2-3x+2=0,B={x|1≤x≤5,x∈Z},C={x|2<x<9,x∈Z}.
(1)求A∪(B∩C);
(2)求(∁UB)∪(∁UC).
答案
(1)依题意有:A={1,2},B={1,2,3,4,5},C={3,4,5,6,7,8},
∴B∩C={3,4,5},故有A∪(B∩C)={1,2}∪{3,4,5}={1,2,3,4,5}.
(2)由∁UB={6,7,8},∁UC={1,2};
故有(∁UB)∪(∁UC)={6,7,8}∪{1,2}={1,2,6,7,8}.