С 15 20 6.4. Выполните действия: 52 - 2 16-² 1) 3) 5) 7) 2x х - 4 C2 8 2c + 3 - 3 со a + 2 + 7 (a - b)2 - 16c 9-4c² 2c³ 2a (a + 2)2 ³ 5 b - О 9) a + - 1 О 1 11) c+1-7; ; 2) 4) 6) 12n - 5 n² - 49 21y² + 1 1 - 9y² 8) 12) a (3a + 1)2 10) b- 4 (m - n)2 О + - а² b b - 2 7 + 1 6 Зу y n 4 3а + 1 7 n - - m -a+1. a +​
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