Question

Уравнения и неравенство(!)

Answer 1

1.
x>0
log(5)x=t
t²-4t-5=0
t1+t2=4 U t1*t2=-5
t1=-1⇒log(5)x=-1⇒x=0,2
t2=5⇒log(50x=5⇒x=3125
2
{5x-3>0⇒5x>3⇒x>0,6
{5x-3≥1/3⇒5x≥3 1/3⇒x≥2/3
x∈[2/3;∞)