Question

满足MUN={1,2,3}.M交N={1}的集合M,N共有几组?

Answer 1

M∪N={1,2,3}

M∩N={1}

M={1},N={1,2,3}

M={1,2},N={1,3}

M={1,2},N={1,2,3}

M={1,3},N={1,2}

M={1,3},N={1,2,3}

M={1,2,3},N={1}

M={1,2,3},N={1,2}

M={1,2,3},N={1,3}

M={1,2,3},N={1,2,3}

共8组

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