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Calculati:
(X+5)(x-5)=
(5+3)(5-3)=
(7-2x)(7+2x)=
(3x-2x)(3x+2x)=
(ax+bx)(ax-bx=
(9+7)(9-7)=


Răspuns :

x²-25
8x2=16
49-4x²
9x²-4x²
a²x²-b²x²
16 x 2 =32