Question

復數

2-i

1+i

的實部與虛部之和為______．

Answer 1

2-i

1+i

=

(2-i)(1-i)

(1+i)(1-i)

=

1-3i

2

=

1

2

-

3

2

i．
所以實部與虛部的和等于

1

2

-

3

2

=-1．
故答案為-1．