gaokao 2025 Q1

gaokao · China · national-I 5 marks Complex Numbers Arithmetic Identifying Real/Imaginary Parts or Components

The imaginary part of $(1 + 5\mathrm{i})\mathrm{i}$ is
A. $-1$
B. $0$
C. $1$
D. $6$

The imaginary part of $(1 + 5\mathrm{i})\mathrm{i}$ is\\
A. $-1$\\
B. $0$\\
C. $1$\\
D. $6$