Rút gọn phận thức: 8xy(3x-1)^3/12x^3 (1-3x)

* Hướng dẫn giải

$\frac{8\mathrm{xy}{\left(3\mathrm{x}-1\right)}^3}{12{\mathrm{x}}^3\left(1-3\mathrm{x}\right)}=\frac{-8\mathrm{xy}{\left(1-3\mathrm{x}\right)}^3}{12{\mathrm{x}}^3\left(1-3\mathrm{x}\right)}=\frac{-2\mathrm{y}{\left(1-3\mathrm{x}\right)}^2}{3{\mathrm{x}}^2}$