Răspuns:
Explicație pas cu pas:
a) ln ^2x-3 ln x+2=0 notam ln x=u
u²-3u+2=0 u1,2=3±√9-8/2=3±1/2 u1=2 u2=1
ln x=2 ⇒x=e²
ln x=1 ⇒x=e
b) 6lg^2x-5 lg x+1=0 notam lg x=t
6t²-5t+1=0 t1,2=5±√25-24/12=5±1/12⇒
lg x=1/2 x=10^(1/2)=√10
lg x=-1/3 x=10^(-1/3)=1/∛10
b) 6lg^2x-5 lg x+1=0