2/5x²y·(-0.5xy)²-(-2x)³·xy³

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2/5x²y·(-0.5xy)²-(-2x)³·xy³

2/5x²y·(-0.5xy)²-(-2x)³·xy³
2/5x²y·(-0.5xy)²-(-2x)³·xy³

2/5x²y·(-0.5xy)²-(-2x)³·xy³
2/5x²y·(-0.5xy)²-(-2x)³·xy³
=(2/5)x^2y*(1/4)x^2y^2+8x^3*xy^3
=(1/10)x^4y^3+8x^4y3
=(81/10)x^4y^3