Le 6 !!! S'il vous plait. (20points)

S= 3(5-15)-18-5×6
S= 3(-10)-18-5×6
S= -30-18-30
S= -78

T= -13+(8-15)(17-9)+4
T= -13+(-7)×8+4
T= -13+(-56)+4
T= -69+4
T=-65

U= 36-4(8-3)-[10-5(5-3×2)]
U= 36-4(8-3)-[10-5(5-6)]
U= 36-4(8-3)-[10-5×(-1)]
U= 36-4(8-3)-(10-(-5)
U= 36-4×5-15
U= 36-20-15
U= 1

S = 3 (5 - 15) - 18 - 5 x 6
S = 3 (- 10) - 18 - 30
S = - 30 - 18 - 30
S = - 78

T = - 13 + (8 - 15) (17 - 9) + 4
T = - 13 + (- 7) (8) + 4
T = - 13 - 56 + 4
T = - 69 + 4
T = - 65

U = 36 - 4 (8 - 3) - [10 - (5- 3 x 2)]
U = 36 - 4 (5) - [10 - (5 - 6)]
U = 36 - 20 - (10 - (- 1))
I = 36 - 20 - 10 + 1
U = 36 + 1 - 20 - 10
U = 37 - 30
U = 7