Réponses

2013-06-12T22:21:45+02:00

a/ 4x+20=10x+3

4x-10x= 3-20

-6x=-17

x= -17/-6

 

b/ 3x-6=6x+24

3x-6x= 24 +6

-3x= 30

x=30/-3= -10

 

c/ -35x au carré +21x =5x-15+2

-35x au carre +21x -5x =-13

-35x au carre +16x =  -13

 

d/ 7n+14 -3 = 25 -3n -4

7n +3n = -14 +3 -4

10n= -15

n =- 15/10 = - 3/2

 

e/ 4y+12y-6 = 3y +3

4y+12y-3y = 6+3

13y =9

y=9/13