设U={1,2,3,4,5,6,7,8},A={3,4,5},B={4,7,8}.求:(1)∁UA(2)∁UB(3)∁UA∩∁UB.
题型:解答题难度:一般来源:不详
设U={1,2,3,4,5,6,7,8},A={3,4,5},B={4,7,8}.求: (1)∁UA (2)∁UB (3)∁UA∩∁UB. |
答案
由U={1,2,3,4,5,6,7,8},A={3,4,5},B={4,7,8}. 所以(1)∁UA={1,2,6,7,8}; (2)∁UB={1,2,3,5,6}; (3)∁UA∩∁UB={1,2,6,7,8}∩{1,2,3,5,6}={1,2,6}. |
举一反三
已知集合A={x|2≤x≤8},B={x|1<x<6},C={x|x>a},U=R. (1)求A∪B; (2)求(∁UA)∩B; (3)如果A∩C≠∅,求a的取值范围. |
设全集U={1,2,3,4,5},集合A={1,2},B={2,3},则A∩∁UB=( ) |
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