(а+1)(а-2)(а-3)=(а+1)(а²-3а-2а+6)=(а+1)(а²-5а+6)=
а³-5а²+6а+а²-5а+6=а³-4а²+а+6;
(3а-2)(а+3)(а-7)=(3а-2)(а²-7а+3а-21)=
(3а-2)(а²-4а-21)=3а³-12а²-63а-2а²+8а+42=
3а³-14а²-55а+42
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(а+1)(а-2)(а-3)=(а+1)(а²-3а-2а+6)=(а+1)(а²-5а+6)=
а³-5а²+6а+а²-5а+6=а³-4а²+а+6;
(3а-2)(а+3)(а-7)=(3а-2)(а²-7а+3а-21)=
(3а-2)(а²-4а-21)=3а³-12а²-63а-2а²+8а+42=
3а³-14а²-55а+42