a)
A={1,2,3,4,5}
5<_x+2<11, scadem 2
3<_x<9
B={3,4,5,6,7,8}
x={[(3+3):3]^10}:(2^8)=(2^10):(2^8)=2^2=4, x=4 (''^''=la puterea)
y=2+(5^100)(3^12 -3^12)=2, y=2
z=(7^6)/(7^6)=1, z=1
C={1,2,4}
b)
''T''=intersectat
ATB={3,4,5}
BTC={4}
c)
C-A={O} (multimea vida)
C-B={1;2}
d)
AUBUC={1,2,3,4,5,6,7,8}
ATBTC={4}
e)(A-B)U(B-C)={1:2}U{3,5,6,7,8}={1,2,3,5,6,7,8}
