gaokao 2018 Q2

gaokao · China · national-III-science 5 marks Complex Numbers Arithmetic Complex Division/Multiplication Simplification

$( 1 + i ) ( 2 - i ) =$
A. $- 3 - \mathrm { i }$
B. $- 3 + \mathrm { i }$
C. $3 - i$
D. $3 + i$

$( 1 + i ) ( 2 - i ) =$\\
A. $- 3 - \mathrm { i }$\\
B. $- 3 + \mathrm { i }$\\
C. $3 - i$\\
D. $3 + i$