Réponses

2014-03-31T18:14:52+02:00
Bonsoir

a=-3(+x)=1-5x
a = -3 x = 1 -5x
a = -3x +5x = 1
a = 2x = 1 ⇒x =1 /2


b=4-7(2-x)=5-4x
4 - 14 + 7x = 5 -4x
7x +4x = 5 +14 -4
11x = 15 ⇒x = 15/11


x/5=7/2
tu mets sur 10
2x = 35 ⇒ x = 35/2 = 17.5


b=3-x/2=x+1/3
tu mets sur 6
18 - 3x = 6x + 2
-3x -6x = 2 -18
-9x = -16 ⇒x = 16/9