Simplifier le plus possible des fractions.

a) = -40/-15 = 8/3 b) = -7/12 c) =1/3 d) = -13/11

Bonsoir voici les résultats : 
a) 5x(-8)x2/2x3x(-5) = -80/-30 = 8/3
b) -42/72 = -21/36 = -7/12
c) 120/360 = 12/36 = 2/6 = 1/3
d) 52/-44 = 26/-22 = 13/-11