已知集合M={a2,0,a},N={1,2},有M∩N={1},则M∪N=( )A.{a,a2,0,1,2}B.{-1,0,1,2}C.{
已知集合M={a2,0,a},N={1,2},有M∩N={1},则M∪N=()A.{a,a2,0,1,2}B.{-1,0,1,2}C.{0,1,2}D.不能确定...
已知集合M={a2,0,a},N={1,2},有M∩N={1},则M∪N=( )A.{a,a2,0,1,2}B.{-1,0,1,2}C.{0,1,2}D.不能确定
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