bjr
vous savez que (a - b)² = a² - 2ab + b²
donc
(5x - 3)² = (5x)² - 2 * 5x * 3 + 3² = 25x² - 30x + 9
:)
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bjr
vous savez que (a - b)² = a² - 2ab + b²
donc
(5x - 3)² = (5x)² - 2 * 5x * 3 + 3² = 25x² - 30x + 9
:)