设全集U={2,3,a²-a-1}···
设全集u={2.4,-(a-3)²},集合a={2,a²-2+2}.若a在u中的补集={-1},求实
设全集U={1,2,x²-2},A={1,x},则CuA=
设全集U={3,4,a²+2a-3},集合A={a+1,2a},CUA={5},求a的值,
设全集u={2,3,a²+2a-3},A={2a-1|,2},CuA={5},则实数a等于?
设全集U=R,集合A={X|-1
设全集U=R,A={x|-1
设全集U=R,集合A={xl-2
题设全集U=R,A={X小于等于6}求:(1)A∩空集.A∪空集(2)A∩R,A∪R(3)全集A的补集(4)A∩(全集A
设全集U={1,2,3,4,5},A={2,3,4},则C∪A=
设全集U={1,2,3,4,5},其子集A={5,1}则A∩CUA
设全集U ={1 ,2 ,3 ,4 ,5},A ,B 是U的子集,若A∩B={1} ,A ∩ Cu B={2} ,
设全集U={2,3,a^2+2a-3}A={|2a-1|,2},CuA={5} 求集合{a,a^2}的子集个数