7.(解答题)-|||-(1)设A、B为二事件,已知 (A)=0.5, (B)=0.7,-|||-(Aoverline (B))=0.1 则 (Acup B)= __ (overline (A)B)= __-|||-(2)设A、B为二事件,已知 (A)=0.5, (B)=0.7,-|||-(Acup B)=0.8 则 (Aoverline (B))= __ (overline (A)B)= __