gaokao 2021 Q2

gaokao · China · national-I Complex Numbers Arithmetic Complex Division/Multiplication Simplification

2. C
Solution: $z ( \bar { z } - i ) = ( 2 - i ) ( 2 + 2 i ) = 6 + 2 i$, so the answer is $C$.

2. C

Solution: $z ( \bar { z } - i ) = ( 2 - i ) ( 2 + 2 i ) = 6 + 2 i$, so the answer is $C$.