Упростить выражение: 1. a² +(3a-b)² 2.96² - (a-3b)² 3. (5 + y)² + y(y-7) 4. a(4-a)+(4-a)2 5. (5a+7b)² - 70ab 6. (8a-b)² - 64a² 7. (x-8)² - 2x(x-6)² 8. (c+7)c-(1-c)² упрости выражение ДАЮ 65БАЛЛОВ​
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