设全集是实数集R,A={X|2X.X-7X+3
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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.X-7X+3<=0},B={X|X.X+a<0}.当a=-4时,求A与B的交集和并集
设全集是实数集R,A={X|2X.X-7X+3
2x-7x+3=(2x-1)(x-3)<=01/2<=x<=3A={x|1/2≤x≤3}(1)当a=-4时B={x|x^2+a<0}={x|x^2-4<0}={x|-2≤x≤2}A并B={x|-2≤x≤3}A交B={x|1/2≤x≤2}
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|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丨2x²-7x+3≤0},B={x丨x²+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
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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
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