gaokao 2015 Q11

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

11. Let $i$ be the imaginary unit. Then $i - \frac { 1 } { i } =$ \_\_\_\_.

11. Let $i$ be the imaginary unit. Then $i - \frac { 1 } { i } =$ \_\_\_\_.