Bonjour
I = 12/5 - 3/5 x 7/9
I = 12/5 - 21/45
I = (12 x 3) / (5 x 3) - (3 x 7) / (3 x 15)
I = 36/15 - 7/15
I = 29/15
J = 7/3 - 4/3 : 2/5
J = 7/3 - 4/3 x 5/2
J = (7 x 2) / (3 x 2) - 20/6
J = 14/6 - 20/6
J = - 6/6
J = - 1
K = (2/3 - 3) : 1/9
K = [2/3 - (3 x 3) / (1 x 3)] : 1/9
K = (2/3 - 9/3) : 1/9
K = - 7/3 x 9
K = 63/3
K = (3 x 21) / (3 x 1)
K = 21
L = 1/3 - 1/3 x 4/7
L = (1 x 7) / (3 x 7) - 4/21
L = 7/21 - 4/21
L = 3/21
L = (3 x 1) / (3 x 7)
L = 1/7
M = 6/5 : (1/15 - 1/5)
M = 6/5 : [1/15 - (1 x 3) / (5 x 3)]
M = 6/5 : (1/15 - 3/15)
M = 6/5 : - 2/15
M = 6/5 x - 15/2
M = - 90/10
M= (10 x - 9) / (10 x 1)
M = - 9
N = 3/5 - 1/5 x (5/2 + 2)
N = 3/5 - 1/5 x [5/2 + (2 x 2) / (1 x 2)]
N = 3/5 - 1/5 x (5/2 + 4/2)
N = 3/5 - 1/5 x 9/2
N = 3/5 - 9/10
N = (3 x 2) / (5 x 2) - 9/10
N = 6/10 - 9/10
N = - 3/10
O = 5 + (1 + 1/8) : 3/4
O = 5 + [(1 x 8) / (1 x 8) + 1/8] x 4/3
O = 5 + (8/8 + 1/8) x 4/3
O = 5 + 9/8 x 4/3
O = 5 + 36/24
O = (5 x 2) / (1 x 2) + (12 x 3) /(12 x 2)
O = 10/2 + 3/2
O = 13/2.
