Bonjour,
S=
-15/28 * 42/-25 = -630/ -700= 63/70 = 9/10 ( c'est bien le signe +)
T =
64/44 * 55/-72 = 3 520/-3 168 =1760/ -1584= 880/-792= 440/-396=
220/-198 = 110/ -99 = 10/- 9
U=
12 * 16/45 = 192/45= 64/15
v = -48 *21/32 = -1008 / 32 = -504/ 16 = -252/8 = -126/4 = -63/2
w =
(7/12)* (18/5) = 126/60
-5/12 = -25 /60
126/60 - 25/60 = 101/60
x=
-1/24 +2/24= 1/24
-3/8 -1 = -3/8 - 8/8 = -11/8
1/24 * 8/-11 = 8/- 264 = 1/ -33
