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.X-7X+3 设全集是实数集R,A={x|2x^2-7x+3 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|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|1/2≤X≤3},B={X|X2 a 设全集是实数集R,A={x|y=√7x-2x∧2-3},B={x|x∧2+a 设全集是实数集R,A={X|2x^2-7x+3≤0},B={X|y^2+a 设全集是实数集R,A={X|2x^2-7x+3≤0},B={X|y^2+a 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R,A={x丨2x²-5x-3≤0},B={x丨x²+a 设全集是实数R,A={x|2x^2-7x+3≤0},B={x|x^2+a 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. 设全集是实数集R,M={x|-2≤x≤2},N={x|x 设全集是实数集R,M={x|-2小于等于x小于等于2},N={x|x 设全集U是实数集R,M={x|x^2>4},N={x|log2(x-1) 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|1/2≤X≤3},B=｛X|X²+a