-2x³y+4x²y-2xy

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-2x³y+4x²y-2xy-2x³y+4x²y-2xy-2x³y+4x²y-2xy-2xy（x^2-2x+1）=-2xy(x-1)^2

-2x³y+4x²y-2xy
-2x³y+4x²y-2xy

-2x³y+4x²y-2xy
-2xy（x^2-2x+1）=-2xy(x-1)^2