A
x+2 / 50
x+2 apartine 1, 50, 2, 25, 5, 10
x apartine 48, 0, 23,3, 8
diviyibile cu 3 sunt 48, 0, 3
deci A={0, 3, 48}
B
2x+3 /18
2x +3 apart 1, 18, 2, 9, 3,6
2x apart 15, 6, 0, 3
x apart 3, 0
deci B={0,3}
C
4<=2x<10 impart la 2
2<= x < 5
x apart 2. 3, 4
2x+1 / 7
2x+1 apart 1, 7
2x apart 0, 6
x apart 0,3
deci C={3}