3.补集的性质 (1)∁UU= _____________ ; (2)∁U∅=_____________; (3)A∪(∁UA)=_________; (4)A∩(∁UA)= _____________ ; (5)∁U(∁UA)=__________; (6)(∁UA)∪(∁UB)= _____________ ; (7)(∁UA)∩(∁UB)= _____________ .
∅
∁U(A∩B)
∁U(A∪B)