Répondre :
K = 5/7 - 14/25 x 15/49
=5/7-2/5x3/7
=5/7-6/15
=75/105-42/105
=33/105
=11/35
L = 3 x 7/2 - 3/2
=21/2-3/2
=18/2
=9/1
=9
=5/7-2/5x3/7
=5/7-6/15
=75/105-42/105
=33/105
=11/35
L = 3 x 7/2 - 3/2
=21/2-3/2
=18/2
=9/1
=9