Réponses

2014-05-22T17:53:49+02:00
A) 3(x-1)-(4x-2)=-3x+5
3x-3-4x+2 = -3x+5
-x-1 = -3x+5
-x+3x = 5+1
2x = 6
x = 6/2
x = 3

b)(2R+3)-(4R+7)=5+2(4R+1)
2R+3-4R-7 = 5+8R+2
-2R-4 = 7+8R
-4-7 = 8R+2R
-11 = 10R
R = -11/10

c)(4a+7)x3-(5-3a)=6(3a-5)
12a+21-5+3a = 18a-30
15a+16 = 18a-30
16+30 = 18a+15a
46 = 33a
a = 46/33
Jte remercie de m'avoir aider :)
tu peux cliquer sur merci. de rien