Répondre :
b) 7/5x =2/3
x=2/3*5/7
x=10/21
c) 5x/2=3/4
5x=3/4*2
5x=3/2
x=3/2*1/5
x=3/10
e) 4/13x=6/26
x=6/26*13/4
x=3/2*1/2
x=3/4
f) 9x/2 =3/6
x=3/6*2/9
x=1/3*1/3
x=1/9
x=2/3*5/7
x=10/21
c) 5x/2=3/4
5x=3/4*2
5x=3/2
x=3/2*1/5
x=3/10
e) 4/13x=6/26
x=6/26*13/4
x=3/2*1/2
x=3/4
f) 9x/2 =3/6
x=3/6*2/9
x=1/3*1/3
x=1/9
7/5x=2/3
10x=21
x=21/10
5x/2=3/4
20x=6
x=6/20 ou 3/10
4x/13=6/26
104x=78
x=78/104 ou 3/4
9x/2=3/6
54x=6
x=6/54 ou 1/9
10x=21
x=21/10
5x/2=3/4
20x=6
x=6/20 ou 3/10
4x/13=6/26
104x=78
x=78/104 ou 3/4
9x/2=3/6
54x=6
x=6/54 ou 1/9