-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³

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-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³
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-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³
-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³

-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³
-2(a²bc)²×½a(bc)³-(abc)²×(-abc)³=-(a²bc)²a(bc)³+(abc)²(abc)³=0