Răspuns:
Explicație pas cu pas:
6.A={0,1,2,3,4,5}
x=0,1,2,3,4,5; y=1,2,3,4,5,6 (x+1)=>B={1,2,3,4,5,6}
AUB={0,1,2,3,4,5,6} A-B={0} B-A={6}
7.A={0,1,2,3,4}
x=0,1,2,3,4; y=2,3,4,5,6=>B={2,3,4,5,6}
A intersectat cu B={2,3,4}
AUB={0,1,2,3,4,5,6} A-B={0,1} B-A={5,6}
8.x=1+2,1+3,1+4,3+2,3+3,3+4,5+2,5+3,5+4=>x=3,4,5,6,7,8,9
C={3,4,5,6,7,8,9}, cardinalul lui C fiind 7
