[tex] \frac{3x}{1-2x+4 x^{2} } * (-1- 8^{3}x) [/tex]

3х---------------- * (-1-8х³) =1-2х+4х²3х---------------- *( -1)* (1+(2х)³) =1-2х+4х²3х---------------- * (-1)* (1+2х)(1-2х+4х²) = 3х* (-1)* (1+2х) = - 3х* (1+2х)1-2х+4х²