Réponses

2014-01-23T20:55:43+01:00
Bonsoir

8(3 -x ) +4x -8 = 24 - 8x +4x -8 = -4x - 16

8(3 -x) +4x -8 = 11
24 - 8x +4x -8 = 11
-4x = 11 -24 +8
-4x = -5
x = 5/4
j'ai oublié le suivant : 3(x+4) = 4(-8 +x) = 3x +12 = - 32 +4x = 3x -4x = -32 -12 = -x = - 44 donc x = 44
2014-01-23T21:00:50+01:00
46) 8(3-x)=24-8x
8(3-x)+4x-8=11 <=> 24-8x+4x-8-11=0 <=> 4x-5=0 <=> x=5/4

47)
3(x+4)=3x+12
4(-8+x)=-32+4x 
3(x+4)=4(-8+x) <=> 3x+12=-32+4x <=>  3x+12+32- 4x=0 <=> x= - 44