已知M={1,2,a2-3a-1},N={-1,a,3},M交 N={3},求实数a的值
人气：437 ℃ 时间：2020-06-02 03:49:45
解答
M交 N={3},
所以a2-3a-1=3
a2-3a-4=0
（a+1)(a-4)=0
所以a=-1或a=4
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