计算:(x^2 - 3x - 28)/(x^2 + 5 - 6x) / (3x+12)/(x^3 - 10x^2 + 25x)

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计算:(x^2 - 3x - 28)/(x^2 + 5 - 6x) / (3x+12)/(x^3 - 10x^2 + 25x)
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计算:(x^2 - 3x - 28)/(x^2 + 5 - 6x) / (3x+12)/(x^3 - 10x^2 + 25x)
计算:(x^2 - 3x - 28)/(x^2 + 5 - 6x) / (3x+12)/(x^3 - 10x^2 + 25x)

计算:(x^2 - 3x - 28)/(x^2 + 5 - 6x) / (3x+12)/(x^3 - 10x^2 + 25x)
(x-7)(x+4)/(x+6)(x-1)/3(x+4)/x(x-5)^2