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={1,2,3}, ={x|(x+1)(x-2)<0,x∈Z.},则A.∪B.=( ) A.{1} B.{1,2} {0,1,2,3} {-1,0,1,2,3}
{1,2,3} {0,1,2,3} {2} {﹣1,0,1,2,3}
={-1,3,5},若f:x→2x-1是集合A.到集合 的映射,则集合B.可以是( ) A.{0,2,3}B.{1,2,3} {-3,5} {-3,5,9}
{1,2,3} {0,1,2,3} {-2,-1,0,1,2} {-3,-2,-1,0,1,2,3}
{1,2,3} {0,2,3} {﹣3,5,9} {﹣3,5}
={0,1,2,3}, ={x|x(x-3)<0},则A.∩B.= ( ) A.{0,1,2,3}B.{0,1,2} {1,2} {1,2,3}
={1,2,3}, ={4,5},M={x|x=a+b,a∈A,b∈B},集合M.真子集的个数为( )A.32B.31 16 15
{-2,-1,0,1,2,3} {-2,-1,0,1,2} {1,2,3} {1,2}
{x│0≤x<1} {x│0≤x<2} {x│0≤x≤1} {x│0≤x≤2}
={x|(x-1)(x+2)=0}; ={x|(x+2)(x-3)=0},则集合A.∪B.是( ) A.{-1,2,3} B.{-1,-2,3} {1,-2,3} {1,-2,-3}
={-1,3,5},若f:x→2x-1是集合A.到集合 的映射,则集合B.可以是 ( ) A.{-3,5,9 , 10}B.{1,2,3} {-3,5} {0,2,3}
{1,2,3, 5} ф {0} {1,3,5,7, 11, 13, 17, 19}
={x|x2﹣4<0}, ={1,2,3},则A∩B.=( ) A.{1,2,3} B.{1,2} {1} {2}
{2} {1,2,3} {﹣1,0,1,2,3} {0,1,2,3}
{1,2,3} {0,1,2,3} {2} {﹣1,0,1,2,3}
={1,2,3}, ={x|﹣1<x<3,x∈Z.},则A.∪B.等于( ) A.{1}B.{1,2} {0,1,2,3} {1,2,3}