126 х³ + 3х² +3х +1 = 125х³ + х³ + 3х² +3х +1 = 125х³ +( х³ + 3х² +3х +1) = 125х³ +( х+1)³ =
(5х)³ +( х+1)³ = (5х + х+1)(25 х² - 5х(х+1) +(х+1)²) = (6Х+1) (25 х² - 5х² -5х + х² +2х+1) =
(6Х+1) (21 х² - 3х +1)
=
126 х³ + 3х² +3х +1 = 125х³ + х³ + 3х² +3х +1 = 125х³ +( х³ + 3х² +3х +1) = 125х³ +( х+1)³ =
(5х)³ +( х+1)³ = (5х + х+1)(25 х² - 5х(х+1) +(х+1)²) = (6Х+1) (25 х² - 5х² -5х + х² +2х+1) =
(6Х+1) (21 х² - 3х +1)
=