comme vous savez que k (a + b) = k * a + k * b
vous aurez
A = 5 * x + 5 * 14 = 5x + 80
B = -3 * 6 - 3 * x = -18 - 3x
C = x * 4x + x * (-1) = 4x² - x
et
D = -10x * x - 10 * (-20) = -10x² + 200x
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comme vous savez que k (a + b) = k * a + k * b
vous aurez
A = 5 * x + 5 * 14 = 5x + 80
B = -3 * 6 - 3 * x = -18 - 3x
C = x * 4x + x * (-1) = 4x² - x
et
D = -10x * x - 10 * (-20) = -10x² + 200x