Calculer astucieusement chaque expression. A=-11,5x2,5x(-2)x(-3)x(-4) B=9x(-100)x5x(-20)x(0,07) C=-0,07x(-5)x(-4)x100x(-20) SVP aider moi

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