(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x

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(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x
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(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x
(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)
-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x

(-2ab^2)^3·(ab^2-3a^2b-1/2a^3)-5x^2(x^2-2x-4)=5x(x^3-2x^2-4x-1)+4x

原式
=-8a³b^6(ab²-3a²b-1/2a³)
=-8a^4b^8+24a^5b^7+4a^6b^6