Exercice numeros 3 merci.

A = 27*101
A = 27*(100+1)
A = 27*100+27*1
A = 2700+27
A = 2727

B = 57*99
B = 57*(100-1)
B = 57*100-57*1
B = 5700-57
B = 5643

C = 53*1002
C = 53*(1000+2)
C = 53*1000+53*2
C = 53000+106
C = 53106

D = 24*998
D = 24*(1000-2)
D = 24*1000-24*2
D = 24000-48
D = 23952