1/2 log3 4/81-1/3 log3 8/27
Log3 (4/81)^(1/2) - log3 (8/27)^(1/3) = = log3 (2/9) - log3 (2/3) = = log3 (2/9 : 2/3) = = log3 (2/9 * 3/2) = = log3 (3/9) = = log3 (1/3) = = log3 (3^(-1)) = = - 1