c simple mon ami
A=(n³+3n²+n)(n³+3n²+n+2)+1
A=(n³+3n²+n)(n³+3n²+n)+2(n³+3n²+n)+1 (on a developpé)
A=(n³+3n²+n)² + 2(n³+3n²+n)*1 + 1
A=(n³+3n²+n+1)²
B= n(n+1)(n+2)(n+3)+1
B= n(n+3) (n+1)(n+2) +1
B= (n²+3n) (n²+n+2n+2) +1
B= (n²+3n) (n²+3n+2) +1
B= (n²+3n)² + 2(n²+3n) +1 comme l exo prec
B= (n²+3n+1)²