10. \(\frac{12x^2(x-2)}{3x(x-2)}=\)

Сокращаем на \(3x(x-2)\): \(\frac{12x^2(x-2)}{3x(x-2)}=4x\), \(x\ne0\), \(x\ne2\).

Ответ: \(4x\)