计算:(8y^2/x-2y)+(x^2/2y-x)-(4y^2/x-2y)
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计算:(8y^2/x-2y)+(x^2/2y-x)-(4y^2/x-2y)
计算:(8y^2/x-2y)+(x^2/2y-x)-(4y^2/x-2y)
计算:(8y^2/x-2y)+(x^2/2y-x)-(4y^2/x-2y)
原式=[8y²(x-2y)]-[x²/(x-2y)]-[4y²/(x-2y)]
=(8y²-x²-4y²)/(x-2y)
=-(x²-4y²)/(x-2y)
=-(x+2y)(x-2y)/(x-2y)
=-x-2y
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