(3/4)* log_(4)81=log_(4)81^(3/4)=
=log_(4)(81^(1/4))^3=log_(4)3^3=log_(4)27
(2/3)*log_(4)125 =log_(4)125^(2/3)=log_(4)(5^3)^(2/3)=
=log_(4)5^2=log_(4)25
2 log4 10+3/4 log4 81–2/3log4 125=
=log_(4)100+log_(4)27-log_(4)25=log_(4)(100*27/25) =
=log_(4)108
log_(4)x=log_(4)108
x=108
О т в е т. 108