(1/8a^3b^2c-4a^2b^3)(2a^2bc)^3

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(1/8a^3b^2c-4a^2b^3)(2a^2bc)^3

(1/8a^3b^2c-4a^2b^3)(2a^2bc)^3
=(1/8a^3b^2c-4a^2b^3)(8a^6b³c³)
=a^6b^6c^4-32a^8b^6c^3