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={﹣1,1,3}, ={1,a2﹣2a},B.⊆A.,则实数a的不同取值个数为( ) A.2B.3 4 5
{1,2} {1,2,3,4} {1,2,3} {1,2,4}
={x|(x﹣1)(x+2)>0},集合 ={﹣3,﹣2,﹣1,0,1,2},则A.∩B.等于( ) A.{0,1}B.{﹣3,﹣2} {﹣3,2} {﹣3,﹣2,1,2}
={0,1,2}, ={x|x=2a,a∈A.},则A.∩B.中元素的个数为( ) A.0 B.1 2 3
={x|x2-3x+2=0}, ={x|x=2a,a∈A.},则集合∁U.(A.∪B.)中元素的个数为( ) A.1B.2 3 4
(﹣3,2) (﹣3,2] [﹣4,4) (﹣3,4)
M.={(3,2)},N.={(2,3)} M.={3,2},N.={2,3} M.={(x,y)|x+y=1},N.={y|x+y=1} M.={(3,2)},N.={3,2}
M.={(3,2)},N.={(2,3)} M.={3,2},N.={2,3} M.={(x,y)|x+y=1},N.={y|x+y=1} M.={1,2},N.={(1,2)}
{0,1} {﹣3,﹣2} {﹣3,2} {﹣3,﹣2,1,2}
,则a的可取值组成的集合为( ) (A.){-3,2} ( ){-3,0,2} ( ){3,-2} ( ){3,0,-2}