gaokao 2020 Q2

gaokao · China · national-III-science 5 marks Complex Numbers Arithmetic Identifying Real/Imaginary Parts or Components
The imaginary part of the complex number $\frac { 1 } { 1 - 3 \mathrm { i } }$ is
A. $- \frac { 3 } { 10 }$
B. $- \frac { 1 } { 10 }$
C. $\frac { 1 } { 10 }$
D. $\frac { 3 } { 10 }$
The imaginary part of the complex number $\frac { 1 } { 1 - 3 \mathrm { i } }$ is

A. $- \frac { 3 } { 10 }$

B. $- \frac { 1 } { 10 }$

C. $\frac { 1 } { 10 }$

D. $\frac { 3 } { 10 }$