Bonjour
U = 7 x 8 - 54 : 6 + 4 x (7 + 2)
U = 56 - 9 + 4 x 9
U = 56 - 9 + 36
U = 56 + 36 - 9
U = 92 - 9
U = 83
V = 4 x (50 - 7 x 7) + 3 x 3
V = 4 x (50 - 49) + 9
V = 4 x 1 + 9
V = 4 + 9
V = 13
W = 4 x (5 + 2) + (12 - 42 : 7) : (37 - 6 x 6)
W = 4 x 7 + (12 - 6) : (37 - 36)
W = 28 + 6 : 1
W = 28 + 6
W = 34.