Bonjour et merci de votre aide, j'ai fait jusqu'à D A= (x+4)+(3x+5) = 4x+3x+5 = 7x+5
B= (x-2)-(2x+3) = -2x - 2x - 3 = 4x² - 3
C= (-x+12) - (x-5) = -12x + 5x
D= (x-7) - (-x+3) = -7x +3x
E= - (-3-x) + (-7+3) - (4x-5)
F= - (x+2) - (2x - 3) - (x+7)
B= (x-2)-(2x+3) = -2x - 2x - 3 = 4x² - 3
C= (-x+12) - (x-5) = -12x + 5x
D= (x-7) - (-x+3) = -7x +3x
E= - (-3-x) + (-7+3) - (4x-5)
F= - (x+2) - (2x - 3) - (x+7)
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