Bonjour
S = - 15/28 : - 25/42
S = - 15/28 x - 42/25
S = 630/700
S = (70 x 9) / (70 x 10)
S = 9/10
T = 63/44 : - 72/55
T = 63/44 x - 55/72
T = - 3 465/3 168
T = (99 x - 35) / (99 x 32)
T = - 35/32
U = 12 : 45/16
U = 12 x 16/45
U = 192/45
U = (3 x 64) / (3 x 15)
U = 64/15
V = - 48 : 32/21
V = - 48 x 21/32
V = - 1 008/32
V = (16 x - 63) / (16 x 2)
V = - 63/2
W = - 5/12 + 7/12 : 5/18
W = - 5/12 + 7/12 x 18/5
W = - 5/12 + 126/60
W = (- 5 x 5) / (12 x 5) + 126/60
W = - 25/60 + 126/60
W = 101/60
X = (1/24 - - 2/24) : (- 3/8 - 1)
X = (1/24 + 2/24) : [- 3/8 - (1 x 8) / (1 x 8)]
X = 3/24 : (- 3/8 - 8/8)
X = (3 x 1) / (3 x 8) : (- 11/8)
X = 1/8 x - 8/11
X = - 8/88
X = (8 x - 1) / (8 x 11)
X = - 1/11.
