282) Найдите значение алгебраического выражения: 1) 7 (4а + 3b) – 6 (5а + 7Ь) при а = 2, b = -3;
2) а (2b + 1) — b (2а – 1) при а = 10, b = -5;
3) Заb (4a® - h') + 4ab (Б° — 3а”) при а = 10, b = -5;
4) 4а во второй степени (5а – 3b) – 5а во второй степени (4а + b) при а = -2, b = -3.​
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