M = 25/(-3) x (-7)/10
M = 25/3 x 7/10
M = (25x7)/(3x10)
M = (5x5x7)/(3x2x5)
M = (5x7)/(3x2)
M = 35/6
N = (-2)/9 x (-15)/(-7)
N = - 2/9 x 15/7
N = - (2x15)/(9x7)
N = - (2x3x5)/(3x3x7)
N = - (2x5)/(3x7)
N = -10/21
N’hésite pas si tu as des questions !