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{0,1,2} {1,2,3} {1,2} {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}
{1} {1,2} {0,1,2,3} {﹣1,0,1,2,3}
{1} {1,2} {0,1,2,3} {-1,0,1,2,3}
{1,2} {2,3} {0,1,2} {1,2,3}
{l} {l,2} {0,1,2,3} {﹣1,0,1,2,3}
{1} {1,2} {0,1,2,3} {﹣1,0,1,2,3}
(1,3) [1,3] {1,3} {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}
M.⊆N N=M M∩N={2,3} M∪N={1,4}
{2,3} {1,2,3} {1,-1,2,3} {2,3,x,y}