Представить в виде многочлена (раскрыть скобки) 1). (x - 2)(x + 2) 2). (3x + y)(3x - y) 3). (a² - 3)(a² + 3) 4). (5 - y)² 5). (x + 7)2 + (x + 2)(x - 2) 6). (a + 1)(a - 1) – (a + 4)2 7). (x - 5)2 - (x - 7)(x + 7) 8). (c-y)(c + y) (c² + y²)​
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