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

问题描述:

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