Răspuns:
ex 2
a) {1,2,3,4,5,6,7,8,9}
b) {1,2,3,7,4,5,6,7,12}
c) {1,2,3,5,6,7,8,9,12}
d) {5,6,7}
e) {1,2,3,7}
f) {7}
g) { 1,2,3,4,5,6,7,8,9,12}
h) { 7}
i) {1,2,3,4}
j) { 5,6,8,9}
k) { 4,5,6}
l) { 1,2,3,4,5,6,7}
sper că te-am ajutat
mult succes la școală!!!