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13: efectuati
(x+2)(x-2)=
(2x-1)(2x+1)=
(2x+3)(2x-3)=
(x+6)(x-6)=
(3x-7)(3x+7)=
(x+4)(x-4)=
(x la puterea a 2-1)(x la puterea a 2+1)=
(4x-3)(4x+3)=
(5x-3)(5x+3)=