Réponses

2014-05-29T21:23:11+02:00

A=5/4 x = 2 +1/4 x
A=(5 x)/4 = (x+8)/4
x= 2

B=-1/2x+5=3/2x+9
B=(10-x)/2 = (3 (x+6))/2
x= -2

C=7/3(x+3)=9
C=(7 (x+3))/3 = 9
C= (7 x)/3+7 = 9
x= 6/7

D=3/4(4-x)=-2
D=3-(3 x)/4 = -2
x= 20/3


A=x/x+2=3/5  impossible

B=x/x+4=7/9 aussi impossible

C=3/4=x/x+5 tellement impossible

D=7/7+x=2/5 et comme toujours c'est impossible