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{﹣3,﹣2,﹣1,0} {﹣2,﹣1,0} {﹣3,﹣2,﹣1} {﹣2,﹣1}
{0,1} {0,1,2} {﹣1,0,1} {﹣1,3}
={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
{0} {0,1} {﹣1,1} {﹣1,0,1}
{-2,-1,0,1} {-3,-2,-1,0} {-2,-1,0} {-3,-2,-1}
{0} {0,1} {-1,1} {-1,0,1}
{0,1} {0,1,2} {﹣1,0,1} {﹣1,3}
{﹣1,0,1} {0,1} (﹣1,1) (﹣1,3)
{-2,-1,0,1} {-3,-2,-1,0} {-2,-1,0} {-3,-2,-1}
{﹣1,0} {0,1,2} {﹣1,0,1} {﹣2,﹣1,0}
{﹣1,0} {0,1,2} {﹣1,0,1} {﹣2,﹣1,0}
{1,2} {x|x≤1} {﹣1,0,1} R.
={x|x≥0},且A.∩B=B,则集合 可能是( ) A.{1,2}B.{x|x≤1} {﹣1,0,1} R.
={x|x≥0},且A.∩ =B.,则集合B.可能是( ) A.{1,2}B.{x|x≤1} {-1,0,1} R.
{0,1} {0,1,2} {-1,0,1} {-1,0,1,2}
{0,1} {-1,0,1} {0,1,2} {-1,0,1,2}
{﹣2,﹣1,0,1} {﹣2,﹣1,0} {﹣1,0,1} {﹣1,0}
{0,1} {﹣1,0,1} {0,1,2} {﹣1,0,1,2}