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∅ {0,2,3} {-1,1} {0,1,2,3}
={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}
{﹣2,﹣1,0,1,2} {﹣1,0,1,2} {﹣1,0,1,2,3} {﹣2,﹣1,0,1,2,3}
-2,-1,0,1,2,3 -1,0,1,2 -2,-1,0,1,2,3 -1,0,1,2,3
{1,2,3} {0,1,2,3} {-2,-1,0,1,2} {-3,-2,-1,0,1,2,3}
{0,1,2} {﹣1,0,1,2} {﹣1,0,2,3} {0,1,2,3}
{﹣1,0,1,2} {0,1,2} {﹣1,0,1,2,3} {0,1,2,3}
﹣2,﹣1,0,1,2,3 ﹣1,0,1,2,3 ﹣2,﹣1,0,1,2,3 ﹣1,0,1,2
-2,-1,0,1,2,3 -1,0,1,2,3
-2,-1,0,1,2,3 -1,0,1,2
{0,1} {0,1,2} {-1,0,1} {-1,0,1,2}
{1} {0,1} {﹣1,0,1,2} {﹣1,0,1,2,3}
{-2,-1,0,1,2,3} {-2,-1,0,1,2} {1,2,3} {1,2}