设全集是实数集R,A={x丨x2-4x+3≤0},B={x丨x-a2
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设全集是实数集R,A={x丨x2-4x+3≤0},B={x丨x-a2
设全集是实数集R,A={X|1/2≤X≤3},B={X|X2 a
设全集U是实数集R,M={x|x2},N={x|x^2-4x+3
设全集是实数集R,A={X|2X.X-7X+3
设全集是实数集R,A={x|2x^2-7x+3
设全集U是实数集R,M=={x|x2},N={x|x 的平方-4x+3
设全集是实数集R,A={X|1/2≤X≤3},B={X|X+a
设全集是实数集R,A={X|1/2≤X≤3},B={X|X+a
设全集是实数集R,A={x丨2x²-7x+3≤0},B={x丨x²+a
设全集U是实数集R,M={x|x^2>4},N={x|log2(x-1)
设全集U=R,集合A={X|X2-4X+3
设全集U是实数集R,M={x|x^2>4},N={x|1
设全集是实数集R,A={x丨2x-7x+3≤0},B={x丨x+a<0}[1]当a=-4时,求A∩B和A∪B
全集为实数集R,集合A={x2+3x+4=0},则CRA=
设全集是实数集R,A={x|2x²-7x+3≤0}……设全集是实数集R,A={x|2x²-7x+3≤0},B={x|x²-4<0},求A∩B和A∪B.
设全集是实数R,A={x丨2x²-5x-3≤0},B={x丨x²+a
设全集是实数集R,A={x|y=√7x-2x∧2-3},B={x|x∧2+a
设全集为实数集,集合A={x||x|