a) 2x+1 divide 6⇒ 2x+1 ∈D6={1,-1,2,-2,3,-3,6,-6}⇒
2x∈{ 0,-2,1,-3,2,-4,6,-7}⇒x∈{0,-1,1,-2,3}
b) 3x-1 divide -8⇒ 3x-1∈ D(-8)={1,-1,2,-2,4,-4,8,-8}⇒
3x∈{ 2,0,3,1,5,-3,9,-7}⇒x∈{ 0,1,-1,3}
c)semnul " / "= divide
5x+1 / 4x-2 \inmultim cu 5
5x+1 / 5x+1 /inmultim cu 4
5x+1 /20x -10
5x+1 / 20x+4 scadem de sus in jos si obtinem:
5x+1 / -14 ⇒ 5x+1 ∈D(-14)={1,-1,2,-2,7,-7,14,-14}
5x∈{0,-2,1,-3,6,-8,13,-15}⇒ x∈{0,-3}
d) 12x-1 /3x+4 \inmultim cu 4
12x-1 / 12x-1
12x-1 / 12x+16
12x-1 /12x-1 , scadem de sus in jos:
12x-1 / 17 ⇒12x-1 ∈D17={1,-1,17,-17}⇒12x∈{2,0,18,-16}⇒x∈{ 0}
