13.9. Найдите значение выражения:
1) 8а² (а - 5) – 4а(а² – 7) при а= 3;
2) b(-9b² + 1) + 3b(3b² + b) при b = -2;
3) (3x-4)(8х + 2) - 24х² - 2 при х= 2;
4) (c² + 3)(с – 9) - с²(с - 6) при с= -5.​
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