全集I=R,A={x x2-2x-3

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全集I=R,A={xx2-2x-3全集I=R,A={xx2-2x-3全集I=R,A={xx2-2x-3A={x|x²-2x-3

全集I=R,A={x x2-2x-3
全集I=R,A={x x2-2x-3<0}B={x 绝对值x<2}则A∪GIB= GI(A∩B)=

全集I=R,A={x x2-2x-3
A={x| x²-2x-3