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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

NOTREHISTOIRE

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

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