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e)
x≥0 i x-1≥0 ⇒ x≥1
D=<1,+∞)
m.z. x=1
f)
x-2≥0 i x+2≥0 ⇒ x≥2
D=<2,+∞)
m.z. x=2
8.
c)
|x|≥0 i 2x-5≥0 ⇒ x≥2,5
D=<2,5 , +∞)
d=3∈ D
d)
-x≥0 i x+1≥0
x≤0 i x≥-1
D=<-1,0>
b=0 ∈ D