1) S = (m+n)² = m² + 2mn + n²
2) S = (5x — 2)² = 25x² - 20x + 4
если x = 7; то 25x² - 20x + 4 = 25*7² - 20*7 + 4 = 1089
1) S = (m+n)² = m² + 2mn + n²
2) S = (5x — 2)² = 25x² - 20x + 4
если x = 7; то 25x² - 20x + 4 = 25*7² - 20*7 + 4 = 1089