Объяснение:
(a+1)(a-1)(+1)-=
-82+18*=-82+18*=-82+2=-80
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Объяснение:
(a+1)(a-1)(
+1)-
=![(a^{2}-1)(a^2+1)-(81-18a^2+a^4)=a^4-1-81+18a^2-a^4=-82+18a^2 (a^{2}-1)(a^2+1)-(81-18a^2+a^4)=a^4-1-81+18a^2-a^4=-82+18a^2](https://tex.z-dn.net/?f=%28a%5E%7B2%7D-1%29%28a%5E2%2B1%29-%2881-18a%5E2%2Ba%5E4%29%3Da%5E4-1-81%2B18a%5E2-a%5E4%3D-82%2B18a%5E2)
-82+18*
=-82+18*
=-82+2=-80