Plz pour demain . ....​

Réponse:

Bsr, Calculons D et E sachant que x+y=-4.

D=-12-(y-x)+4+2y

= -12-y+x+4+2y

= -12+4+x+(2y-y)

= -8+x+(y)

= -8+(x+y)

or x+y=-4 on a :

= -8+(-4)

= -8-4

D=-12.

E=2x-7-(-y+x)

= 2x-7+y-x

= -7+2x-x+y

= -7+x+y

= -7+(x+y)

Or x+y=-4 on a:

= -7+(-4)

= -7-4

E=-11. Bonne journée ))))