Ответ:
(7x-4y)² = (7x)² - (2√7x)(4y) + (4y)² = 49x² - 28√7xy + 16y²
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Ответ:
(7x-4y)² = (7x)² - (2√7x)(4y) + (4y)² = 49x² - 28√7xy + 16y²