Bonjour,
- 18/40 x - 30/21 x 77/- 12
= 540/840 x - 77/12
= - 41 580/10 080
= (1 260 x - 33) / (1 260 x 8)
= - 33/8.
A=-18/40*(-30/21)*77/-15
A=-[2*3*3*3*10*11*7/(10*2*2*7*3*3*5)]
A=-[3*11/(2*5)]
A=-33/10
