化简0.5x乘以x乘以y乘以x-y乘以x乘以x^2+0.5x乘以x乘以y
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化简0.5x乘以x乘以y乘以x-y乘以x乘以x^2+0.5x乘以x乘以y
化简0.5x乘以x乘以y乘以x-y乘以x乘以x^2+0.5x乘以x乘以y
化简0.5x乘以x乘以y乘以x-y乘以x乘以x^2+0.5x乘以x乘以y
0.5x乘以x乘以y乘以x-y乘以x乘以x^2+0.5x乘以x乘以y
=0.5x³y-x³y+0.5x²y
=-0.5x³y+0.5x²y
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