Крч ща объясню, будет так - x^3 - 3 (2 + x)^3 = -8 ; x^3 - 3 ( 8 + 12x + 6x^2 + x^3) = -8 ; x^3 - 24 - 36x - 18x^2 - 3x^3 = - 8 ; - 2x^3 - 36x - 18x^2 = 16 ; x ( -2x^2- 36 - 18x) = 16 ;x ( -2x^2 - 18x) = 52 ;
-12х+5х-4х=-11х
ь-6а-10ь+9а+4ь=-5ь+3а
7, *,*,*,*,*,*,35
а1, ..........,а8
а8=а1+7d
7+7d=35
7d=28
d=4
7, 11, 15, 19, 23, 27, 31, 35