Bonjour,
A = 8x - 7 + 3x - 12
A = 11x - 19
B = -5 - 19x - 4 + 3x
B = -9 - 16x
C = 9x² + 5 × x × 2 - x × x + 8x
C = 9x² + 10x - x² + 8x
C = 8x² + 18x
D = 3 + 7 - x - 25 + 5x
D = 10 - 25 + 4x
D = 4x - 15
E = 6x - 7(-4 - 7x - 2 × x × 9) - 4x
E = 6x + 28 + 49x + 18x - 4x
E = 69x + 28
F = -18x² + 54 - 23x + 56x² - 49x - 2
F = 38x² - 72x + 52
En espérant t'avoir aidé !
