A = j'ai simplifié ce qui pouvait l'être
tu as : 12 x4x72x121/9x33x32 = 418176/9504 = 44
B = 840/128 -1/15 = 15120/ 2304 - 128/2304 = 14992/2304 = 937/144
C = 35/25 = 7/5
= 24/15 + 7/5 = 24/15 + 21/15 = 45/15 = 3
il reste donc 3 x 20/33 = 60/33
D = 81/63 = 9/7 et 2/14 = 1/7
9/7 + 28/7 - 1/7 = 36/7
E = 5/6-5/4 = 10/12-15/12 = -3/12
1/2 +2/3 = 3/6 +4/6 = 7/6
-3/12 X 7/6 = -21/72 = -7/24
il reste 56/15 X -7/24 = 392/-360 = - 196/180 = -98/90 = -49/45
