Bonjour,
Exercice 1:
-5,5/-9
=5,5/9
=5,5×4/9×4
=22/36
-17/6
=-17×6/6×6
=-102/36
1,5/2
=1,5×18/2×18
=27/36
7/-12
=-7/12
=-7×3/12×3
=-21/36
-5/3
=-5×12/3×12
=-60/36
Exercice 2:
6/-13
=-6/13
=-6×3/13×3
=-18/39
-1/2
=-1×18/2×18
=-18/36
9/7
=9×2/7×2
=18/14
-2/11
=-2×9/11×9
=-18/99
3/-5
=-3/5
=-3×6/5×6
=-18/30
Exercice 3:
-21/15
= -21÷-3/15÷-3 = 7/-5
= -21×2/15×2 = -42/30
= -21÷7/15÷7 = -3/2,14
6/12
= 6÷-6/12÷-6 = -1/-2 = 1/2
= -21×-3/12×-3 = 63/-36
= 6×2/12×2 = 12/24
= 6×5/12×5 = 30/60
