Question

скоротіть дріб: 6) $\frac{(9b ^ 2 - 1)}{(9b ^ 2 + 6b + 1)}$

Answer 1

Ответ:

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(9b² - 1) / (9b² + 6b + 1) = ((3b + 1)(3b - 1)) / (3b + 1)² = (3b - 1) / (3b + 1)

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