问题
选择题
已知i是虚数单位，则
|
答案
复数
=-1+i 1+i
=(-1+i)(1-i) (1-i)(1+i)
=i，2i 2
故选 D．
搜题请搜索小程序“爱下问搜题”
已知i是虚数单位，则
|
复数
=-1+i 1+i
=(-1+i)(1-i) (1-i)(1+i)
=i，2i 2
故选 D．
Passage One
What is the most appropriate title for the passage
A．The Future of Sugar Industry in Central America
B．Unemployment in Latin America
C．Reforms in Sugar Industry in North America
D．The Impact of the Declining Sugar Industry