Répondre :
9 x6/ 25=54/25
6/10x35/14x2/31=3/5x35/14x2/31=3x7/14x2/31=3x1/2x2/31=3x1/31=3/31
2/27x21/14=2/27x7/2=7/27
3/6x9/12x15/18=1/2x3/4x5/6=15/48=5/16
6/10x35/14x2/31=3/5x35/14x2/31=3x7/14x2/31=3x1/2x2/31=3x1/31=3/31
2/27x21/14=2/27x7/2=7/27
3/6x9/12x15/18=1/2x3/4x5/6=15/48=5/16