问题详情:
已知全集U={1,2,3,4,5,6,7},A={x|x≥3,x∈N},则∁UA等于( )
(A){1,2} (B){3,4,5,6,7}
(C){1,3,4,7} (D){1,4,7}
【回答】
A解析:因为U={1,2,3,4,5,6,7},A={x|x≥3,x∈N}={3,4,5,6,7},
所以∁UA={1,2}.故选A.
知识点:*与函数的概念
题型:选择题
问题详情:
已知全集U={1,2,3,4,5,6,7},A={x|x≥3,x∈N},则∁UA等于( )
(A){1,2} (B){3,4,5,6,7}
(C){1,3,4,7} (D){1,4,7}
【回答】
A解析:因为U={1,2,3,4,5,6,7},A={x|x≥3,x∈N}={3,4,5,6,7},
所以∁UA={1,2}.故选A.
知识点:*与函数的概念
题型:选择题