问题
选择题
若复数z=（a-1）+i（a∈R）是纯虚数，则
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答案
复数z=（a-1）+i（a∈R）是纯虚数，所以a=1
所以
=1+i a-i
=1+i 1-i
=(1+i)(1+i) (1-i)(1+i)
=i2i 2
故选B．
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若复数z=（a-1）+i（a∈R）是纯虚数，则
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复数z=（a-1）+i（a∈R）是纯虚数，所以a=1
所以
=1+i a-i
=1+i 1-i
=(1+i)(1+i) (1-i)(1+i)
=i2i 2
故选B．
| 综合填空。 | |
chemical plant 2 terrible gas. It's called 3 pollution. It makes people 4 . It causes 5 problems and even cancer. Farmers use fertilizer too much, so 6 pollution is difficult to be stopped. Every year people pour a lot of waste into rivers, lakes 7 . So 8 pollution is widely spread. Light pollution is 9 to our eyes. What's more, 10 pollution influences the look of our cities. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. |