Ответ:
(7m - 2)² - (7m - 1)(7m + 1) = 49m² - 28m - 4 - (49m² - 1) = 49m² - 28m + 4 - 49m² + 1 = 5 - 28m
Объяснение:
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Ответ:
(7m - 2)² - (7m - 1)(7m + 1) = 49m² - 28m - 4 - (49m² - 1) = 49m² - 28m + 4 - 49m² + 1 = 5 - 28m
Объяснение: