设A={1,2,3,4,5,6,7},B={1,2,3},C={3,4,5},求:(1)A∪(B∩C); (2)A∩?A...
设A={1,2,3,4,5,6,7},B={1,2,3},C={3,4,5},求:(1)A∪(B∩C);(2)A∩?A(B∪C)....
设A={1,2,3,4,5,6,7},B={1,2,3},C={3,4,5},求:(1)A∪(B∩C); (2)A∩?A(B∪C).
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