Definitie pt. parte intreaga
[x]=a ⇔ a ≤ x < a+1
a) [x]=3 ⇔ 3 ≤ x < 4 ⇔ x ∈ [3,4)
b) [x+2]=-3 ⇔ -3 ≤ x+2 <-2 |-2 ⇔-5 ≤ x < -4 ⇔ x∈[-5,-4)
c) [2x]=3 ⇔ 3 ≤ 2x < 4 |:2 ⇔ 3/2 ≤ x < 2 ⇔ x∈[3/2,2)
d)[tex][ \frac{3x+1}{2} ]=5[/tex]⇔[tex]5 \leq \frac{3x+1}{2} \ \textless \ 6 [/tex] ⇔
[tex]10 \leq 3x+1\ \textless \ 12[/tex] ⇔ [tex]9 \leq 3x\ \textless \ 11[/tex] ⇔
[tex]3 \leq x\ \textless \ \frac{11}{3} [/tex] ⇔ x∈[3,11/3)