Réponses

2013-04-15T01:03:40+02:00

1) -12x=2(3x-1)+10x+20

-12x=6x-2+10x+20

-12x=16x+18

28x=-18

x=-18/28=x=-9/14

 

 

 

2) 4(1-4x)=3(3-7x)

4-16x=9-21x

5x=5

x=1

 

 

 

 

 

 

 

 

 

 

Meilleure réponse !
2013-04-15T02:19:24+02:00

1) -12x = 2(3x-1) +10x +20

-12x = 6x -2 +10x +20

-12x = +16x +18

-12x -16x = +18

-28x = +18

x = -28/18

x = -9/14

 

2) 4(1-4x) = 3(3-7x)

4 -16x = 9 -21x

-16x +21x = 9 - 4

5x = 5

x = 5/5

x = 1