2/5x²y·(-0.5xy)²-(-2x)³·xy³
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![2/5x²y·(-0.5xy)²-(-2x)³·xy³](/uploads/image/z/3022288-16-8.jpg?t=2%2F5x%26%23178%3By%C2%B7%EF%BC%88-0.5xy%EF%BC%89%26%23178%3B-%EF%BC%88-2x%EF%BC%89%26%23179%3B%C2%B7xy%26%23179%3B)
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