(1/2x²y-2xy+y²)×3xy
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(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
=3/2x³y²-6x²y²+3xy³
(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
(1/2x²y-2xy+y²)×3xy
=3/2x³y²-6x²y²+3xy³