gaokao 2015 Q2

gaokao · China · sichuan-science Complex Numbers Arithmetic Complex Division/Multiplication Simplification

2. Let $i$ be the imaginary unit, then the complex number $i ^ { 2 } - \frac { 2 } { i } =$
A. $-i$ B. $-3i$
C. $i$ D. $3 i$

2. Let $i$ be the imaginary unit, then the complex number $i ^ { 2 } - \frac { 2 } { i } =$\\
A. $-i$ B. $-3i$\\
C. $i$ D. $3 i$