Sagot :
Bonsoir,
A= 4y × (-2) × x ×y
-8y *xy = -8xy²
B= 4× (7- y) × x × (-2)
(28-4y) * -2x
= -56x -8xy
C= 5 x² - x + 4 x 2-4 +7 x
5x² -x +8 -4 +7x
= 5x² +6x +4
Salut!!
A= 4y × (-2) × x ×y
-8y × xy = -8xy²
B= 4× (7- y) × x × (-2)
(28-4y) × -2x
= -56x -8xy
C= 5 x^2 - x + 4 x 2-4 +7 x
5x^2 -x +8 -4 +7x
= 5x^2 +6x +4