i+1/i
我认为应该是(i+1)/i
否则1/i=-i
i-i=0不太可能这么问
(i+1)/i
=1+1/i
=1-i
(1-i)^3
=(1-i)(1-i)(1-i)
=(1-2i+i^2)(1-i)
=(-2i)(1-i)
=-2i+2i^2
=-2-2i