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={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}
={-1,0,1},B={x|-1≤x<1},则A.∩ =( ) A.{0} B.{-1,0} {0,1} {-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}
{-2,-1,0,1} {-3,-2,-1,0} {-2,-1,0} {-3,-2,-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} {0,1} {﹣1,0} {﹣1,0,1}
={﹣1,0,1,2}, ={x|x<2},则A.∩B.=( ) A.{﹣1,0,1}B.{﹣1,0,2} {﹣1,0} {0,1}
={-2,-1,0,2}, ={x|(X-1)(x+2)<0},则A.∩B= (A.){--1,0} (B.){0,1} ( ){-1,0,1} ( ){,0,,1,2}
={﹣1,0,1}, ={x|1≤2x<4},则A.∩B等于( ) A.{1}B.{﹣1,1} {1,0} {﹣1,0,1}
{0} {﹣1,0} {0,1} {﹣1,0,1}
={﹣3,﹣2,﹣1}, ={x∈Z.|﹣2≤x≤1},则A.∪B.=( ) A.{﹣1}B.{﹣2,﹣1} {﹣3,﹣2,﹣1,0} {﹣3,﹣2,﹣1,0,1}
{0,1} {0,1,2} {-1,0,1} {-1,0,1,2}
{0} {﹣1,0} {0,1} {﹣1,0,1}
{﹣2,﹣1,0,1} {﹣2,﹣1,0} {﹣1,0,1} {﹣1,0}
={-2,-1,0,1,2},B={x|(x -1)(x+2)<0},则A.∩B=( ) A. {--1,0} {0,1} {-1,0,1} {,0,,1,2}