<span>х(2х - 9)</span>² <span>- 2х(15 + х)</span>² = х(4х² - 36х + 81) - 2х(225 + 30х + х²) =
= 4х³ - 36х² + 81х - 450х - 60х² - 2х³ = 2х³ - 96х² - 369х
{x=-2+y {x=-2+y {x=-2+y {x=-8
{-2+y-2y=4 {-2-y=4 {y=-6 {y=-6
(2y/(y+b)+(b-y)/y)/((b²+y²)/(b+y))=((2y²+b²-y²)/(y*(y+b))/((b²+y²)/(b+y)=
=((b²+y²)/(y*(b+y))/((b²+y²)/(b+y))=1/y.
1/(х-3)(х+3)+2-х/х-3= х(х+3)/(х-3)(х+3)=х^+3х/(х-3)(х+3)=х(х+3)/(х-3)(х+3)=х/х-3