х-3 (х-3 )⁾*(х+2х² )-(х-3 )*(х+2х² )⁾
у⁾=(-----------)⁾ = ----------------------------------------- =
х+2х² (х+2х² )²
1*(х+2х²) - (х-3)*(1+4х) х+2х² -(х-3+4х²-12х)
= ---------------------------------------- = --------------------------------- =
(х+2х² )² (х+2х² )²
х+2х² - х+3 -4х²+12х -4х²+12х+3
= --------------------------------- = -----------------------------
(х+2х² )² (х+2х² )²