已知集合M={a,0},N={1,2},有M∩N={1},那么M∪N等于( ) A.{a,0,1,2} B.{1,0,1,2}
已知集合M={a,0},N={1,2},有M∩N={1},那么M∪N等于()A.{a,0,1,2}B.{1,0,1,2}C.{0,1,2}D.不能确定...
已知集合M={a,0},N={1,2},有M∩N={1},那么M∪N等于( ) A.{a,0,1,2} B.{1,0,1,2} C.{0,1,2} D.不能确定
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