Răspunsuri

2014-09-23T12:53:50+03:00

a)  18/(2x+3) ∈ Z  înseamnă că (2x+3) divide 18

⇒ (2x+3) ∈{-18.-9,-6,-3,-1,1,3,6,9,18} ⇒ 2x∈{-21,-12,-9,-6,-4,-2,0,3,6,15} / {-21,-9,3,15} ⇒ 2x {-12,-6,-2,0,6} ⇒ x ∈{-6,-3,-1,0,3}