Bonsoir,
M = (4/5 + - 3/2) : (- 9/4 - 1/6)
M = [(4 x 2) / (5 x 2) - (3 x 5) / (2 x 5)] : [(- 9 x 3) / (4 x 3) - (1 x 2) / (6 x 2)]
M = (8/10 - 15/10) : (- 27/12 - 2/12)
M = - 7/10 : - 29/12
M = - 7/10 x - 12/29
M = 84/290
M = (2 x 42) / (2 x 145)
M = 42/145.
