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={x|-3<x<1}, ={x|log2|x|<1}则A.∩B.等( ) A.(-3,0)∪(0,1)B.(-1,0)∪(0,1) (-2,1) (-2,0)∪(0,1)
{3,0} {3,0,1} {3,0,2} {3,0,1,2}
f(a)>0 f(a)<0 f(a)≥0 f(a)≤0
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0<b<a<1 0<a<b<1 a>b>1 b>a>1
2000. 0 2. 0 2. 5 2500. 0
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