1/3(Log1/2 (1/27)+Log1/2 (64))=1/3(Log1/2 (1/27)+Log1/2 (64))=1/3(Log1/2 (1/3)^3+Log1/2 (64))= 1/3(3Log1/2 (1/3)-6)=Log1/2 (1/3)-2