Упростите выражения:
1) (х+1)(х^2-х+1)+(2-х)(4+2х+х^2)
2) а(а-3)^2-(а+3)(а^2-3а+9)
3) (а-5)(а^2+5а+25)-(а-1)(а^2+а+1)
4) (a-b)(a+b)(a^4+a^2b^2+b^4)
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