25) (3^2)/(3^(log(3,18)))=9/18=1/2
26) 5^2*5^(log(5,3))=25*3=75
27) 6^(-2log(6,5)=5^-2=1/25
28) 10/(10^lg(2))=10/2=5
29) -1/2
30) 5.2
31) x^-2=1/4, x = 2
32) x=5
33) 4^2/(4^(log(4,0.25)))=16/0.25=64
34) 3^(2log(3,7))=49
35) 4^(2log(4,81)=81^2=6561
36) log(3/10, 10/3) = -1
37) (1/7)/((1/7)^(log(1/7,7)))=(1/7)/(7)=1/49
38) log(4, 4^3)=3
39) log(9,2)(1/2log(9,2))=1/(1/2)=2
40) x^3=27, x=3