Question

помогите решить неравенство

Answer 1

log2 (x)=t
(t-5)/(1-2/t)>=2t
(t(t-5)-2t(t-2))/(t-2)>=0
t(1+t)/(2-t)>=0
t<-1  log2 (x)<-1  0<x<1/2
log2 (x)>0  x>1
log2 (x)<2  x<4

(0;1/2)U(1;4)