Bonjour,
a) 9/7 = (9×6)/(7×6) = 54/42
54/42 < 57/42 donc : 9/7 < 54/42
b) -16/3 = (-16×4)/(3×4) = -64/12
-23/4 = (-23×3)/(4×3) = -69/12
-64/12 > -69/12 donc : -16/3 > -23/4
c) -5/8 = (-5×3)/(8×3) = -15/24
-15/24 > -19/24 donc : -5/8 > -19/24
d) -7/5 = (-7×2)/(5×2) = -14/10
-3/2 = (-3×5)/(2×5) = -15/10
-14/10 > -15/10 donc : -7/5 > -3/2
tu essayes de faire les deux derniers ?
sachant que 15×4 = 12×5 = 60 et que 12×3 = 9×4 = 36
