Bonjour
Simplifier :
3/7 × 4/7 × 7/5= 12/49 x 7/5 = 84/245 = (7 x 12) / (7 x 35) = 12/35
36/60 = (12 x 3) / (12 x 5) = 3/5
72/54 = (18 x 4) / (18 x 3) = 4/3.
