设集合A={x|y=log2(x-1)},B={y|y=-x^2+2x-2,x属于R}(1)求集合A,B(2)若集合C={x|2x+a<0},且满足BuC=C,求实数a的取值范围
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设集合A={x|y=log2(x-1)},B={y|y=-x^2+2x-2,x属于R}(1)求集合A,B(2)若集合C={x|2x+a<0},且满足BuC=C,求实数a的取值范围
设集合A={x|y=log2(x-1)},B={y|y=-x^2+2x-2,x属于R}
(1)求集合A,B
(2)若集合C={x|2x+a<0},且满足BuC=C,求实数a的取值范围
设集合A={x|y=log2(x-1)},B={y|y=-x^2+2x-2,x属于R}(1)求集合A,B(2)若集合C={x|2x+a<0},且满足BuC=C,求实数a的取值范围
(1)A={x|x>1},B={y|y<=-1}
(2)C={x|x<-a/2},
又因为BUC=C
-a/2>=-1
a<=2