Question

复数z=1-i（i是虚数单位），则

2

z2

-z=______．

Answer 1

∵z=1-i
∴

2

z2

-z=

2

(1-i)2

-(1-i)=

1

-i

-1+i=i-1+i=-1+2i
故答案为：-1+2i