Bonjour,
U= 12÷45/16
12/(45/16)
on multiplie par l'inverse
12* 16/45 = 192/45 = 64/15
V= -48÷32/21
-48/( 32/21)
=-48 * 21/32 = -1 008/ 32 = -504/21= -168/ 7
W= -5/12+7/12÷5/18
-5/12 + (7/12)/(5/18)
=-5/12 + 7/12 * 18/5
= 5/12 +126/60
= 25/60 +126/60
= 151/60