-2xy-4x²y+8三次方y

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-2xy-4x²y+8三次方y-2xy-4x²y+8三次方y-2xy-4x²y+8三次方y原式=2xy(4x²-2x-1)

-2xy-4x²y+8三次方y
-2xy-4x²y+8三次方y

-2xy-4x²y+8三次方y
原式=2xy(4x²-2x-1)