Bonjour,

Exercice 5

x(x²+x+1) +1)  

Exercice 7

2(5x+2 + x+1) =12010

10x+4 +2x +2 = 120

12x+6 = 120

12x= 120 -6

12x =114

x= 114/12 =9,5

exercice 8

x+x+1+x+2+x+3 = 4x + 6

4x+6 = 610

4x= 510 -6 = 504

x= 504/4 = 126

=>126, 127,128,129