已知集合M={a2,a+1,-3},N={A-3,-3,2A+1},若M并集N={a2-7}求实数a的值
人气:190 ℃ 时间:2020-05-17 21:05:07
解答
集合M有-3,N中也有-3,若M并集N={a2-7}应该是交集,2a-7=-3,a=2
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