1) a^3=-0.008 => a=-0.2 => (a+0.2)(a+0.2)(a+0.2)
2) b^3=0.216 => b=0.6 => (b-0.6)(b-0.6)(b-0.6)
3) n^3=-1/0.027 => n=-1/0.3=-10/3 => (n+1/0.3)(n+1/0.3)(n+1/0.3)
4) m^3=1/0.125 => m=1/0.5 => (m-1/0.5)(m-1/0.5)(m-1/0.5)
(в 3 и 4 проверить коэффициенты перед разложением!!!)