Répondre :
1) x5= 31,45
x = 31.45 / 5
x = 6.29
2) x4 X x5= 250
20x = 250
x = 250 / 20
x = 12.5
x = 31.45 / 5
x = 6.29
2) x4 X x5= 250
20x = 250
x = 250 / 20
x = 12.5