gaokao 2015 Q12

gaokao · China · zhejiang-science Laws of Logarithms Simplify or Evaluate a Logarithmic Expression

12. If $a = \log _ { 2 } 3$ , then $2 ^ { a } + 2 ^ { - a } =$ $\_\_\_\_$ .

12. If $a = \log _ { 2 } 3$ , then $2 ^ { a } + 2 ^ { - a } =$ $\_\_\_\_$ .\\