设全集U=R,A={x|x2+px+12=0},B={x|x2-5x+q=0},若(∁UA)∩B={2},A∩(∁UB)={4},求A∪B.
设全集U=R,A={x|x2+px+12=0},B={x|x2-5x+q=0},若(∁UA)∩B={2},A∩(∁UB)={4},求A∪B.
数学人气:160 ℃时间:2019-08-19 03:16:37
优质解答
∵
⇒∴A={3,4},B={2,3}
∴A∪B={2,3,4}
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