(5-х)v^2 - x(2,5+х) = 05v^2 - хv^2 - 2,5x - x^2 = 0v^2(5 - х) - x(2,5 + х) = 0v^2(5 - х) + х(х + 2,5) = 05v^2 - хv^2 + 2,5x = 0
(2v + v^2)^2 + v^2(5 - v)(5 + v) - 4v(v^2 - 3)= (2v + v^2)(2v + v^2) + v^2(25 - v^2) - 4v(v^2 - 3)= (2v^2 + 2v^3 + 2v^2 + v^3) + 25v^2 - v^4 - 4v^3 + 12v= 3v^2 + 3v^3 + 25v^2 - v^4 - 4v^3 + 12v= 28v^2 - v^4 - 1v^3 + 12v
(а - х)(а + х)^2= (а - х)(а^2 + 2ах + х^2)= а^3 + 2а^2х + ах^2 - а^2х - 2ах^2 - х^3= а^3 + 2а^2х + ах^2 - а^2х - 2ах^2 - х^3= а^3 - а^2х - ах^2 - х^3
(5-х)v^2 - x(2,5+х) = 0
5v^2 - хv^2 - 2,5x - x^2 = 0
v^2(5 - х) - x(2,5 + х) = 0
v^2(5 - х) + х(х + 2,5) = 0
5v^2 - хv^2 + 2,5x = 0
(2v + v^2)^2 + v^2(5 - v)(5 + v) - 4v(v^2 - 3)
= (2v + v^2)(2v + v^2) + v^2(25 - v^2) - 4v(v^2 - 3)
= (2v^2 + 2v^3 + 2v^2 + v^3) + 25v^2 - v^4 - 4v^3 + 12v
= 3v^2 + 3v^3 + 25v^2 - v^4 - 4v^3 + 12v
= 28v^2 - v^4 - 1v^3 + 12v
(а - х)(а + х)^2
= (а - х)(а^2 + 2ах + х^2)
= а^3 + 2а^2х + ах^2 - а^2х - 2ах^2 - х^3
= а^3 + 2а^2х + ах^2 - а^2х - 2ах^2 - х^3
= а^3 - а^2х - ах^2 - х^3