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练习
1.写出集合A={-1,0}的所有子集和真子集.
2.判断下面集合之间的关系:
(1)A={x|x2-1=0,B={-1,1};
(2)A={x||x|=3};B={-3,3};
(3)A={1,2,3,4,5};B={4,5,1};
(4)A={2,4,8},B={x|x是16的正因数}.
3.用适当的符号填空.
(1)0______{0,1,2}; (2){0}______{0,1,2};
(3)0______{0}; (4)∅______{0};
(5){1,2}______{2,1,0}; (6){a,b,c}______{a,c};
(7)∅______{0}; (8){x|x2-1=0}______∅;
(9){x|x>5}______{x|5<x<7}; (10){-1}______{x|x2=1};
(11){平行四边形}______{矩形}.