Réponses

Meilleure réponse !
2013-04-30T14:50:15+02:00
A) 4a+5-a = 3a+5
b) -1-3x-4 = -3x-5
c) -3b+4-b+5 = -4b+9
d) 5-2y-7+4y = -2+2y
2013-04-30T14:53:28+02:00

a) 4a-(-5+a)=4a+5-a

                      =3a+5

 

b)-1+(-3x+4)=-1-3x+4

                      = -3x+3

 

c) -3b+4+(-b-5)=-3b+4-b-5

                           =-4b-1

 

d)5-2y-(7-4y)=5-2y-7+4y

                       =2y-2