Réponses

2013-05-19T15:26:29+02:00

a. 14 x-7=8x+5

6x/6=12/6

x=2

 

b. 8a-2=3*(4a-5)

8a-2=12a-15

-4a/-4=-13/-4

a=3.25

 

c.2*(3b+7)=5*(-2b+1)

6b+14=-10b+5

16b/16=-9/16

b=-9/16

 

d. 3*(-1-2t)=4*(1-5t)

-3-6t=4-20t

14t/14=7/14

t=1/2

Meilleure réponse !
2013-05-19T15:31:07+02:00