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6.Спростити вираз та знайти його значення якщо а=2 1/4.
(4-а) (4+а) + (а-1)2 - (16+2а)

7.Довести тотожність
(2n+1) (3n-7)-2 (6n-11)= (n-3) (6n-5).
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