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|X2 a 设全集是实数集R,A=｛x|1/2≤x≤3｝,B=｛x|x²+a＜0｝ 设全集是实数集R,A={X|1/2≤X≤3},B=｛X|X²+a 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≤0},B={X|y^2+a 设全集实数集R,A={x|y=loga(x-1)+√(3-x),B={x|2^x+m≤0} 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 设全集是实数集R,A={x|2x^2-7x+3 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｜-a+1≤x+1≤2a-1},若（CRA）∩B=B,求实数a的取