Bonjour
A = - 14/5 + - 4/33 x - 11/20
A = - 14/5 + 44/660
A = (- 14 x 3) / (5x 3) + (44 x 1) / (44 x 15)
A = - 42/15 + 1/15
A = - 41/15
B = - 15/14 + 4/3 : - 1/3
B = - 15/14 + 4/3 x - 3
B = - 15/14 - 12/3
D = (- 15 x 3) / (14 x 3) - (12 x 14) / (3 x 14)
D = - 45/42 - 168/42
D = - 213/42
D = (3 x - 71) / (3 x 14)
D = - 71/14
C = 7/18 - 5/4 : 15/28
C = 7/18 - 5/4 x 28/15
C = 7/18 - 140/60
C = 7/18 - (20 x 7) / (20 x 3)
C = 7/18 - 7/3
C = 7/18 - (7 x 6) / (3 x 6)
C = 7/18 - 42/18
C = - 35/18
D = - 3/7 + - 9/14 : 9/16
D = - 3/4 - 9/14 x 16/9
D = - 3/4 - 144/126
D = - 3/4 - (18 x 8) / (18 x 7)
D = - 3/4 - 8/7
D = (- 3 x 7) / (4 x 7) - (8 x 4) / (7 x 4)
D = - 21/28 - 32/28
D = - 53/28