[tex]\text{Fie $a, b$ - numerele}.\\[/tex]
[tex]$\frac{a+b}{2} = 6, \text{ } a - b = 18$[/tex]
[tex]$a + b = 12, a - b = 18$[/tex]
[tex](a+b)(a-b) = 12 \cdot 18\\a^{2} - b^{2} = \boxed{216}[/tex]
Fie a,b-doua numere
a+b/2=6
a+b=6×2
a+b=12
a-b=18
a²-b²=
=(a+b)(a-b)=
=12×18=216
