Доведіть тотожність: -4ab = (a - b)2 - (a + b)2; 2) (x - y)2 + 2xy = x2 +y². Знайти значення виразу, якщо а=2, b=-1 2 4 (2b + 3a²) (3a²- 2b) - 9a*​
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