Question

復數

i

i+1

=（　�。�

A． 1 2 + i 2

B． 1 2 - i 2

C．- 1 2 + i 2

D．- 1 2 - i 2

Answer 1

∵

i

i+1

=

i(i-1)

(i+1)(i-1)

=

-1-i

-2

=

1

2

+

i

2

，
故選 A．