Помогите представить в виде произведения многочлен:

1) a³+a²-a-1;
2) 2х³-2хy²-8х²+8y²;
3) 5а²-5b²-15а³b+15аb³;
4) а²b²-1-b²+a².
Заранее спасибо!!!!
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