Question

6 номер на фото смотрите

Answer 1

4) =log8(12*20:15) = log8(16)-?
log8(16) = x
8^x = 16
2^3x= 2^4
3x = 4
x=4/3
5) 5^(3log5(2) = (5^log5(2) )^3 = 2^3 = 8
6)5^(2-log5(9) = 5² * 5^-log5(9)= 25*(5^log5(9))^-1 = 25*1/9 = 25/9