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(1,2,3) (-1,2,3) (1,-2,3) (1,2,-3)
={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}, ={x|(x+1)·(x-2)<0,x∈Z.},则A.∪B.= ( ) A.B.{1,2} {0,1,2,3} {-1,0,1,2,3}
int x[][3]={{0},{1},{1,2,3}}; int x[4][3]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[4][]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[][3]={1,2,3,4};
={x|≤0}, ={0,1,2,3},则A.∩B.=( ) A.{1,2}B.{0,1,2} {1} {1,2,3}
={1,2,3}, ={x|(x﹣3)(x﹣6)=0},则A.∩B.等于( ) A.{1}B.{2,3} {3,6} {3}
{﹣2,3} {0,1} {﹣2,﹣1,2,3} {﹣1,0,1,2}
int x[ ][3]={{0},{1},{1,2,3}}; int x[4][3]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[4][ ]={{1,2,3},{1,2,3},{1,2,3},{1,2,3}}; int x[ ][3]={1,2,3,4};
={0,1,2,3}, ={x|lnx>0},则A.∩B.=( ) A.{0,1,2,3}B.{1,2,3} {2,3} {3}
={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}
{-2,-1,0,1,2,3} {-2,-1,0,1,2} {1,2,3} {1,2}
={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} {1,2} {0,1,2,3} {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}
{2,3} {1,2,3} {1,-1,2,3} {2,3,x,y}