问题
填空题
设 i是虚数单位，若复数
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答案
=a+i 1-i
=(a+i)(1+i) (1-i)(1+i)
+a-1 2
i，根据纯虚数的概念得出 a+1 2
=0a-1 2
≠0a+1 2
解得a=1．
故答案为：1
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设 i是虚数单位，若复数
|
=a+i 1-i
=(a+i)(1+i) (1-i)(1+i)
+a-1 2
i，根据纯虚数的概念得出 a+1 2
=0a-1 2
≠0a+1 2
解得a=1．
故答案为：1
完形填空 One day Mr and Mr Black went shopping by car. They stopped their car near a 1 .They bought many things from the shop and the things were very 2 .They wanted to put them 3 .But Mr Black can’t 4 the door of the car. “Let’s ask a policeman for 5 .,”said Mrs Black. The policeman was very 6 to help them open the door of the car. At that time a 7 .came up and shouted ,”what are you doing with 8 ?”Mr and Mrs Black looked at the 9 of the car. Then they said 10 to the man.
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