A= 4/3 x 5/7 = 4x5/3x7 = 20/21
B= 1/5 x1/8 =1x1/5x8 = 1/40
C= 4/5 x 7/3 = 4x7/5x3 = 28/15
D= 4/7 x 4x3 = 4x4/7x3 = 16/21
E= 7/5 x 7/5 = 7x7/5x5 = 49/25
F= 7 x 3/10 = 7/1 x 3/10 = 7x3/1x10 = 21/10
G= 1/2 x 3/5 x 7x4 = 1x3x7/2x5x4 = 21/40
H= 5 x 1/7 x 8/3 = 5/1 x 1/7 x 8/3 = 5x1x8/1x7x3 = 40/21
Et voilà bonne soirée ( ;
