(log3x)^2-3log3x+2=0

ОДЗ: х > 0
t = log3x
t^2 - 3t + 2 = 0
t = 1, t = 2
1) log3x = 1
    x = 3
2)log3x = 2
    x = 9
Ответ: 3; 9.