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={x∈Z.|-1≤x≤2},集合 ={0,2,4},则A.∩B.=( ) A. {0,2} B. {0,2,4} {-1,0,2,4} {-1,0,1,2,4}
{0,1} {﹣1,0,1} {﹣1,2} {﹣1,0,1,2}
={x|ax2+2x+a=0,a∈R.},若集合A.有且仅有2个子集,则实数a的取值是( ) A.1 0,1 -1, 1 -1,0,1
={x|x2-x-2≤0},集合 为整数集,则A.∩B.=( ) A.{-1,0,1,2}B.{-2,-1,0,1} {0,1} {-1,0}
{0,1} {0} {-1,2,3} {-1,0,1,2,3}
={3,a2},集合 ={0,b,1-a},且A.∩B.={1},则A.∪B.=( ) A.{0,1,3}B.{1,2,4} {0,1,2,3} {0,1,2,3,4}
{﹣1,0} {0,1} {﹣2,﹣1,0,1} {0,1,2}
={0,1},则满足条件A.∪ ={0,1,2,3}的集合B.共有( ) A.1个 B.2个 3个 4个
={0,1,2}, ={2,3},则集合A.∪B.=( ) A.{1,2,3}B.{0,1,2,3} {2} {0,1,3}
={x∈N|0≤x≤5},∁A. ={1,3,5},则集合B.=( ) A.{2,4}B.{0,2,4} {0,1,3} {2,3,4}
{0,1} [0,1] {﹣1,0,1,2} [﹣1,2]
={0,1,2},集合 ={x|x=2m,m∈N},则A.∩B=( ) A.{0}B.{0,2} {0,4} {0,2,4}
={1,2,3,4},集合,集合,则集合C.的真子集的个数为( ) A. 1 2 3 4