4. Решите уравнение:
а) (x – 3)2 – x(x + 2,7) = 9;
б) 9y2 – 25 = 0.
5. Выполнить действия:
а) (x2 + 1)(x – 1)(x + 1);
б) (3a2 – 6b2)(3a2 + 6b2).
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