问题标题:
设全集U={x∈N*|x<9},A={1,2,3},B={3,4,5,6},则(∁UA)∩(∁UB)=______.
问题描述:

设全集U={x∈N*|x<9},A={1,2,3},B={3,4,5,6},则(∁UA)∩(∁UB)=______.

傅维暲回答:
  ∵全集U={x∈N*|x<9}={1,2,3,4,5,6,7,8},A={1,2,3},B={3,4,5,6},   ∴∁UA={4,5,6,7,8},∁UB={1,2,7,8},   则(∁UA)∩(∁UB)={7,8}.   故答案为:{7,8}
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