问题
填空题
A={1}，B={x|x⊆A}，用列举法表示集合B的结果为______．
答案
∵A={1}，B={x|x⊆A}，
∴集合B中只有两个元素：Φ和{1}，
即B={Φ，{1}}．
故答案为：{Φ，{1}}．
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A={1}，B={x|x⊆A}，用列举法表示集合B的结果为______．
∵A={1}，B={x|x⊆A}，
∴集合B中只有两个元素：Φ和{1}，
即B={Φ，{1}}．
故答案为：{Φ，{1}}．
| 综合填空。 | |
used in lots of 2_____ life. It is 3_____ that we won't have to go shopping because we will be able to get most things which are 4_____ in shops on the Internet. There will be 5_____ more books because we will be able to get all text from computers. The Internet will be 6_____ to play games, see films and buy food. 7_____ telephone calls will be made by computer, 8_____. Some people are glad about these new ways of shopping and communicating. Others don't 9_____ that computers will replace our 10_____ ways. |