2.等比数列{an}\{a_{n}\}{an}的各项均为正数,且a4a5=8a_{4}a_{5}=8a4a5=8,则log4a1+log4a2+⋯+log4a8=(\log _{4}a_{1}+\log _{4}a_{2}+\dotsb +\log _{4}a_{8}=(log4a1+log4a2+⋯+log4a8=( )))