问题
选择题
已知i是虚数单位，则
|
答案
∵
=2 1+i
=2(1-i) (1+i)(1-i)
=1-i．2(1-i) 2
故选A．
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已知i是虚数单位，则
|
∵
=2 1+i
=2(1-i) (1+i)(1-i)
=1-i．2(1-i) 2
故选A．
| 从B栏中找出与A栏中各句相对应的答句。 | |
| A ( ) 1. Were the twins at the party last night? ( ) 2. Was Mr Li at work or away yesterday? ( ) 3. How many people were at the meeting? ( ) 4. Why was Liz not here last night? ( ) 5. Were you late this morning? ( ) 6. What did you have for breakfast? | B a . She was ill. b . No, I was quite early. c . Yes, they are. d . I had bread and milk. e . He was at work. f . About twelve. |