Bonjour
I = (9/15 + 3/10) : 6/5
I = [(9 x 2) / (15 x 2) + (3 x 3) / (10 x 3)] : 6/5
I = (18/30 - 9/30) : 6/5
I = 9/30 x 5/6
I = 45/180
I = (45 x 1) / (45 x 4)
I = 1/4
J = 12/7 - 4/7 x 35/12
J = 12/7 - 140/84
J = 12/7 - (28 x 5) / (28 x 3)
J = 12/7 - 5/3
J = (12 x 3) / (7 x 3) - (5 x 7) / (3 x 7)
J = 36/21 - 35/21
J = 1/21
K = (4/5 + 7/10) : (5/6 - 5/8)
K = [(4 x 2) / (5 x 2) + 7/10 : [(5 x 4) / (6 x 4) - (5 x 3) / (8 x 3)]
K = (8/10 + 7/10) : (20/24 - 15/24)
K = 15/10 : 5/24
K = 15/10 x 24/5
K = 360/50
K = (10 x 36) / (10 x 5)
K = 36/5
L = 6/5 + 21/5 : 14/15
L = 6/5 + 21/5 x 15/14
L = (6 x 14) / (5 x 14) + 315/70
L = 84/70 + 315/70
L = 399/70
L = (7 x 57) / (7 x 10)
L = 57/10.
