设全集为R,A={x|2x²-7x+3≤0},B={x|x²+a<0}
设全集为R,A={x|2x²-7x+3≤0},B={x|x²+a<0}
设全集是实数集R,A={x|2x²-7x+3≤0},B={x|x²-a<0}.
设全集是实数集R,A={x丨2x²-7x+3≤0},B={x丨x²+a
设全集为R,A={x|2x²-7x+3≤0},B={x|x²+a<0} (1)若a=-4,求A∩
(1)设全集为R,A={X丨X-1丨<4},B={X丨X²-2X≥0},求ANB,AUB,AnCB
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|1/2≤x≤3},B={x|x²+a<0}
设全集为R,已知A={x丨-2<x<3},B={x²+2x-8>0},M={x丨x²-4ax+3a≤
设全集为实数R,A={2x平方-7x+3≤0},B={x|x平方+a
设全集U=R,A={x|x²-2x-15<0}.B={x|y=lg(x+2)},则A∩B是?
设全集为R,集合A={x|-1<x<3},B={x|x<-2},求:
设全集U=R,A={x|x+1≥0},B={x|x