Bonjour,
B = 8 − 5(3 − 4x)
B = 8 - 5x3 -5x(-4)
B = 8 - 15 + 20x
B = 20x - 7
D = −6 (−2a + 4) + 3 (5a – 1)
D = -6 x (-2a) - 6x4 + 3x5a +3x(-1)
D = 12a - 24 + 15a - 3
D = 27a - 27
F = −4b (3b − 5) + 7b (−3b – 5)
F = -4b x 3b -4b x (-5) + 7b x (-3b) + 7b x (-5)
F = -12b² +20b - 21b² - 35b
F = -33b² - 15b
En espérant t'avoir aidé :)
