7) log (3^3) 3^4 = 4/3 log (3) 3 = 4/3
8)log (10) 10^9/4 = 9/4 log (10) 10 =9/4
9)log (5) 5^5/2 = 5/2 log (5) 5 = 5/2
10)1/4 log(9) 9^2 = 1/4 *2 = 1/2
11)log(2) log(3^2) 3 = log(2) 1/2 = log(2) 2^-1 = -1
12)log(8) log(25)25^2 - 2/3 log(3) 3^3 =
= log(2^3) 2 - 2/3 * 3 = 1/3-2 = 1/3-6/3 = -5/3