Объяснение: =(5x+y-(x-5y))(5x+y+(x-5y))=(5x+y-x+5y)(5x+y+x-5y)=
(4x+6y)(6x-4y)=2·(2x+3y)·2·(3x-2y)=4(2x+3y)(3x-2y)
Объяснение: =(5x+y-(x-5y))(5x+y+(x-5y))=(5x+y-x+5y)(5x+y+x-5y)=
(4x+6y)(6x-4y)=2·(2x+3y)·2·(3x-2y)=4(2x+3y)(3x-2y)