Ответ: 1) 2p^2 + 3pq — pq^2 + 7q^2 — 2pq + 5qq — 9p^2 — 12pq^2 = = 2p^2 + 3pq — pq^2 + 7q^2 — 2pq + 5q^2 — 9p^2 — 12pq^2 = = 2p^2 — 9p^2 + 3pq — 2pq — pq^2 — 12pq^2 + 7q^2 + 5q^2 = = (2p^2 — 9p^2) + (3pq — 2pq) + (-pq^2 — 12pq^2) + (7q^2 + 5q^2) = = p^2(2 — 9) + pq(3 — 2) + pq^2(-1 — 12) + q^2(7 + 5) = = -p^2(-2 + 9) + pq — pq^2(1 + 12) + 12q^2 = = -p^2(9 — 2) + pq — 13pq^2 + 12q^2 = = -7p^2 + pq — 13pq^2 + 12q^2 == -13pq^2 — 7p^2 + 12q^2 + pqОтвет: -13pq^2 — 7p^2 + 12q^2 + pq.2) 27a^2bc + 23abbc — 25abc^2 — 11abc^2 — 33a^2bc + 48acb^2 == 27bca^2 + 23acb^2 — 25abc^2 — 11abc^2 — 33bca^2 + 48acb^2 = = 27bca^2 — 33bca^2 + 23acb^2 + 48acb^2 — 25abc^2 — 11abc^2 = = (27bca^2 — 33bca^2) + (23acb^2 + 48acb^2) — (25abc^2 — 11abc^2) = = bca^2(27 — 33) + acb^2(23 + 48) — abc^2(25 — 11) = = -bca^2(-27 + 33) + 71acb^2 — 14abc^2 = = -bca^2(33 — 27) + 71acb^2 — 14abc^2 = = -6bca^2 + 71acb^2 — 14abc^2Ответ: -6bca^2 + 71acb^2 — 14abc^2