(3/4x立方-3/1xy平方+1/2x的平方y-2/5y的立方)+(-y的立方+1/2x的平方y-1/3x的平方y-4/5x的立方)等于?
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![(3/4x立方-3/1xy平方+1/2x的平方y-2/5y的立方)+(-y的立方+1/2x的平方y-1/3x的平方y-4/5x的立方)等于?](/uploads/image/z/319370-50-0.jpg?t=%EF%BC%883%2F4x%E7%AB%8B%E6%96%B9-3%2F1xy%E5%B9%B3%E6%96%B9%2B1%2F2x%E7%9A%84%E5%B9%B3%E6%96%B9y-2%2F5y%E7%9A%84%E7%AB%8B%E6%96%B9%EF%BC%89%2B%EF%BC%88-y%E7%9A%84%E7%AB%8B%E6%96%B9%2B1%2F2x%E7%9A%84%E5%B9%B3%E6%96%B9y-1%2F3x%E7%9A%84%E5%B9%B3%E6%96%B9y-4%2F5x%E7%9A%84%E7%AB%8B%E6%96%B9%EF%BC%89%E7%AD%89%E4%BA%8E%3F)
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(3/4x立方-3/1xy平方+1/2x的平方y-2/5y的立方)+(-y的立方+1/2x的平方y-1/3x的平方y-4/5x的立方)等于?
(3/4x立方-3/1xy平方+1/2x的平方y-2/5y的立方)+(-y的立方+1/2x的平方y-1/3x的平方y-4/5x的立方)等于?
(3/4x立方-3/1xy平方+1/2x的平方y-2/5y的立方)+(-y的立方+1/2x的平方y-1/3x的平方y-4/5x的立方)等于?
3/4x^3-3xy^2+1/2x^2y-2/5y^3-y^3+1/2x^2y-1/3x^2y-4/5x^3=-1/20x^3+2/3x^2y-3xy^2-7/5y^3