题目内容
已知M={1,2,a2-3a-1},N={-1,a,3},M∩N={3},则实数a的取值的集合是________.
已知M={1,2,(a2-3a-1)+(a2-5a-6)i},N={-1,3},M∩N={3},则实数a=________.
定义集合M和N的新运算如下:M*N={x|x∈M或x∈N,但x(M∩N)}.已知M={1,2,3},N={2,3,4},则(M*N)*M=
M
N
{1}
{4}