1. Упростите выражение:
(c+b) (c-b) - (5c²-b²)

2. Разложите на многожители:
а) 25у²-а²
б)с²+4bc+4b²

3. Разложите уравнение
12-(4-х)²=х(3-х)

4. Выполните действия:
а) (3х+у²) (3х-у²)
б) (а³-6а)²
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