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Bonjour c'est urgent je n'arrive pas a cette exercice! :)) aidez moi svp

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DROOPETTE
1. 10/3-1/3=9/3=3
2. 7/4-9/8=14/8-9/8=5/8
3. (10/12+7/12)*3/5= 17/12*3/5=51/60=17/20
4. 1/6+10/3=1/6+20/6=21/6=7/2
5. (2/5-3/10)*15/4= (4/10-3/10)*15/4=1/10*15/4=15/40=3/8
6. 10/9*18/15=4/3
WINNER123
Bonjour
A = 10/3 - 1/3 = 9/3 = 3
B = 7/4 -3/4 x 3/2 = 7/4 - 9/8 = 14/8 - 9/8 = 5/8
C = (5/6 +7/12) x 3/5 = (10/12 +7/12) x 3/5 = 17/12 x 3/5 = 51/60
D = 3/4 x 2/9 + 28/15 x 25/14 = 1/6 + 10/3 = 1/6 + 20/6 = 21/6
E = (1/3 x 6/5 - 3/10) x 15/4 = (6/15 -3/10) x 15/4 = (12/30 - 9/30) x 15/4 = 3/30 x 15/4 = 3/8
F = 10/9 x 18/15 = 4/3