(3^4x)^2-4*3^4x+3<=0
1<=3^4x<=3
0<=x<=1/4
ответ 0;
75² (3*25)² 3² * 25² 9*25*5*5 5
-------- = ---------- = ------------- = -------------------- = ------- = 5/81
45³ (9*5)³ 9³* 5³ 9²*9*5* 25 9²