求帮忙做几道数学计算题-2^3-(-2)^2+(-3)^2-(-1)^3(-2xy^2)^2(-0.5x^2y^3)(-2/3x^2y^3)(x-2y+1)(x+2y-1)5*399/8+5*1/8(x-2y)(x+2y)(x^2-4y^2)
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![求帮忙做几道数学计算题-2^3-(-2)^2+(-3)^2-(-1)^3(-2xy^2)^2(-0.5x^2y^3)(-2/3x^2y^3)(x-2y+1)(x+2y-1)5*399/8+5*1/8(x-2y)(x+2y)(x^2-4y^2)](/uploads/image/z/1848368-56-8.jpg?t=%E6%B1%82%E5%B8%AE%E5%BF%99%E5%81%9A%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E8%AE%A1%E7%AE%97%E9%A2%98-2%5E3-%28-2%29%5E2%2B%28-3%29%5E2-%28-1%29%5E3%28-2xy%5E2%29%5E2%28-0.5x%5E2y%5E3%29%28-2%2F3x%5E2y%5E3%29%28x-2y%2B1%29%EF%BC%88x%2B2y-1%EF%BC%895%2A399%2F8%2B5%2A1%2F8%28x-2y%29%28x%2B2y%29%28x%5E2-4y%5E2%29)
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