Срочно!Помогите!Буду очень благодарна!Help!
(1+2х)(1-2х+4х²)/(1+2х)-2х=(1-2х)² 1-2х+4х²-2х=(1-2х)² 1-4х+4х²=(1-2х)² (1-2х)²=(1-2х)²