合并同类项：-6x²y-x+5x²y-2x+x³y+3x

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合并同类项：-6x²y-x+5x²y-2x+x³y+3x合并同类项：-6x²y-x+5x²y-2x+x³y+3x合并同类项：-6x²

合并同类项：-6x²y-x+5x²y-2x+x³y+3x
合并同类项：-6x²y-x+5x²y-2x+x³y+3x

合并同类项：-6x²y-x+5x²y-2x+x³y+3x
-6x²y-x+5x²y-2x+x³y+3x
=-6x²y+5x²y-x-2x+3x+x³y
=-x²y+x³y