Bonjour
A=-11,5x2,5x(-2)x(-3)x(-4)
A = -11,5 x 2,5 x-4 x-2x-3
A = -11,5 x -10 x -2x-3
A = -11,5 x -2 x -10 x -3
A = 23x -10 x -3
A = -230 x -3
A =690
B=9x(-100)x5x(-20)x(0,07)
B = -9x -100x -100 x 0,07
B = -9x-100 x -7
B = -9x-7 x -100
B = 63 x -100
B = -6300
C=-0,07x(-5)x(-4)x100x(-20)
C = 0,07 x 100 x -5 x-20 x -4
C = 7 x 100 x -4
C = 7x -4 x 100
C = -28 x 100
C = -2800