Ответ:
(c - b)² = c² - 2bc + b² = b² - 2bc + c²
(7 + x)² = 49 + 14x + x²
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Ответ:
(c - b)² = c² - 2bc + b² = b² - 2bc + c²
(7 + x)² = 49 + 14x + x²