1.

а) х^3+x^2-x-1

б) 16-4a+a^3-a^4

2.

a) (p+k-4)(p+k+4)

б) (a-b+5)(a+b+5)

в) (x-y-6)(x+y+6)

г) (m-n+2)(m+n-2)

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