Réponse :
bonsoir
Explications étape par étape :
A = -2 ( x - 5) - 3(7 - 4x)
A = (-2 × x) + (-2 × -5 ) + (-3 × 7) + (-3) × (-4x)
A = -2x + 10 + (-21) + 12x
A = -2x + 10 - 21 + 12x
A = 10x - 11
-----------------------
B = 8 + 2y - 5(2y - 6 ) + 4
B = 8 + 2y - 10y + 30 + 4
B = -8y + 42
-------------------------------------
C = 3x + 5x (4 - 2x) - 2 ( x² - 3x + 5)
C = 3x + 20x - 10x² - 2x² + 6x - 10
C = 29x - 12x² - 10
C = -12x² + 29x - 10
--------------------------------------
D = 8 + 2x - 2x(3x - 4) + 5x (3 - x)
D = 8 + 2x - 6x² + 8x + 15x - 5x²
D = -11x² 25x + 8
-----------------------------------------------
E = 7y + 4(3y - 6) + 3 + 2(3y - 7)
E = 7y + 12y - 24 + 3 + 6y - 14
E = 25y - 35
bonne soirée
