Bonjour pouvez vous maider svp

Bonjour

L = -20/42 x  -3/7

L = -10/21 x -3/7

L = 30/ 147

L = 3x10 / 3x49

L = 10/49

M = (15/24 -28/24) x (57/35 + 3/35)

M = - 13/24 x 60/35

M = -13/24 x  12/7

M = -13/2 x 1/7

M = -13/14