(5lgx²-1)/(lg²x-1)-1≥0
ОДЗ x>0
(10lgx-1-lg²x+1)/(lg²x-1)≥0
lgx=a
(10a-a²)/(a²-1)≥0
a(10-a)/(a-1)(a+1)≥0
a=0 a=10 a=1 a=-1
+ _ + _ +
--------------(-1)------------[0]------------(1)---------------[10]-----------
a<-1⇒lgx<-1⇒x<0,1<br>0≤a<1⇒0≤lgx<1⇒1≤x<10<br>a≥10⇒lgx≥10⇒x≥10^10
x∈(0;0,1) U [1;10) U[10^10;∞)