в) х<-2.5 D(f)= (-∞: -2.5)

g) x≥7 D(f)=  [7; +∞)

в) x>5 D(f)= ( 5: +∞ )

g) x≤6 D(f)= (-∞: 6]

в) x<2 D(f)=(-∞:2)

g) x≤ - 5 D(f)=(-∞:-5]

в) x< D(f)=(-∞:-5/4)

g) x≤2 D(f)=(-∞:2]