Răspuns:
a) (5+3)^2=5^2 +3^2+2*3*5
8^2=25+9+30
64=34+30 Adevarat
b) (5-3)^2=5^2+3^2-2*3*5
2^2=25+9-30
4=34-30 Adevarat
c) (5+3)(5-3)=5^2-3^2
8*2=25-9
16=16 Adevarat
