-6a^2b*(1/2abc)^2

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-6a^2b*(1/2abc)^2-6a^2b*(1/2abc)^2-6a^2b*(1/2abc)^2-6a^2b*(1/2abc)^2=-6a²b×¼a²b²

-6a^2b*(1/2abc)^2
-6a^2b*(1/2abc)^2

-6a^2b*(1/2abc)^2
-6a^2b*(1/2abc)^2
=-6a²b×¼a²b²c²
=-3/2a^4b³c²