bonsoir

A=3x7/5x14

A=3x7/5x7x2

A=3/5x2=3/10

B=12x7/5x8

B=3x4x7/5x4x2

B=21/10

C=2x15/3x20

C=2x1x5x3/3x2x2x5

C=1/2

D=9x8/4x15

D=3x3x4x2/4x5x3

D=6/5

E=15x9/6x25

E=5x3x3x3/3x2x5x5

E=9/10

F=16/3x6/24

F=4x4x3x2/3x3x2x4

F=4/3

G=12/5x7/6x5/14

G=2x2x3x7x1x5x1/5x1x3x2x7x2

G=1

H=12x11x12

H=6x2x11/6x2

H=11