Ребят, решите прошу, а то секир бошка 1) (а2+1)(a2-1)(a4+1) 2)(x+1)(x-1)-(x+5)(x-5)+(x+1)(x-1)
1) (a^2 + 1)(a^2 - 1)(a^4 + 1) = = (a^4 - 1)(a^4 + 1) = = a^8 - 1 2) x^2 - 1 - (x^2 - 25) + x^2 - 1 = = x^2 - 1 + x^2 - 1 - x^2 + 25 = = x^2 - 2 + 25 = x^2 + 23