-4x²y-8xy²+2x²y-3xy²

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-4x²y-8xy²+2x²y-3xy²
-4x²y-8xy²+2x²y-3xy²

-4x²y-8xy²+2x²y-3xy²
-4x²y-8xy²+2x²y-3xy²
=-2x²y-11xy²
=-xy(2x+11y)

原式=-2x²y-11xy²