Bonjour,
Calculer et donner le résultat sous forme d'une fraction irréductible
S= 15/28 ÷ -25/42
S = 15/28 x - 42/25
S = - 630/700
C = (70 x - 9) / (70 x 10)
C = - 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 --> Je ne sais pas où est la division...
U = 12/45 x 1/16
U = 12/720
U = (12 x 1) /(12 x 60)
U = 1/60
ou
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 --> Idem
V = 48/32 x 1/21
V = 48/672
V = (48 x 1) / (48 x 14)
V = 1/14
ou
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 --> Pas clair non plus // ??
X = - 1/24 + 2/24 x - 8/3 - 1
X = - 1/24 - 16/72 - 1
X = (- 1 x 3) / (24 x 3) - 16/72 - (1 x 72) / (1 x 72)
X = - 3/72 - 16/72 - 7/72
X = - 26/72
X = (2 x - 13) / (2 x 36)
X = - 13/36.