若集合A={x |x小于等于4},B={x|x大于等于a},满足A交B={4},则实数a等于多少?
若集合A={x |x小于等于4},B={x|x大于等于a},满足A交B={4},则实数a等于多少?
数学人气：118 ℃时间：2020-04-05 20:05:04
优质解答
a=4 ∵a=x≤4 b≥a,a∩b只有一个元素,∴a只能为A等于时的那个数
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