Sagot :
a) Si s = 1 :
s × (4+s) = 1 × (4+1) = 5
b) Si s = 10 :
s × (4+s) = 10 × (4+10) = 10 × 14 = 140
c) Si s = 11 :
s × (4+s) = 11 × (4+11) = 11 × 15 = 165
a) Si s = 1 :
s × (4+s) = 1 × (4+1) = 5
b) Si s = 10 :
s × (4+s) = 10 × (4+10) = 10 × 14 = 140
c) Si s = 11 :
s × (4+s) = 11 × (4+11) = 11 × 15 = 165