1) (a^3-9)(a^6+9a^3+81)-a^9-729=...
2) (1,1d-c^3)(1,21d^2+1,1c^3d+c^6)- 1,331d^3+2c^9
2) (1,1d-c^3)(1,21d^2+1,1c^3d+c^6)- 1,331d^3+2c^9
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1)=a^9-9^3-a^9-729=-729-729=-1458
2)=1.331d^3-c^9-1.331d^3+2c^9=-c^9+2c^9=c^9