a.4x = 3/5
x = 3/(5*4) = 3/20
b.2/3 x = 7
ici tu multipli par l'inverse car tu passe ta fraction de l'autre cote :
x = (7*3)/2 = 21/2
c.6/5 x = -7/11
meme chose que le b
x = (-7*5) / (11*6) = -35/66 divisible par 6 donc x = -5/11
d.-7 x = 4/-3
x = 4/(-7*(-3)) = 4 / 21
e.-3/2 x =5
x= (5*2)/(-3) = -(10/3)
f.-5/7 x = -2/-3
x = (-2*7)/(-3*-5) = -14/15
g.5x/7=0
x = 0 ici c'est evident
h.-3/2x=-7/11
x = (-7*2)/(11*(-3)) = -14/(-33) = 14/33
Voila :)
Bon courage
