Respuesta :
GCD (12,6) = 6
GCD (a³,a) = a
GCD (d²,d³) = d²
Then 12a³d² − 6ad³ = 6.a.d²(2a - d)
GCD (a³,a) = a
GCD (d²,d³) = d²
Then 12a³d² − 6ad³ = 6.a.d²(2a - d)
