(4x + 3y)² - (4x - 3y)² = (4x + 3y - 4x + 3y)(4x + 3y + 4x - 3y) = 6y·8x= 48xy
Находим значение при x =
![- \frac{1}{3}](https://tex.z-dn.net/?f=-+%5Cfrac%7B1%7D%7B3%7D+)
, y =
![\frac{1}{8}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B8%7D+)
:
48 · (-
![\frac{1}{3}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B3%7D+)
) ·
![\frac{1}{8}](https://tex.z-dn.net/?f=+%5Cfrac%7B1%7D%7B8%7D+)
= -
![\frac{48}{3*8} = -2](https://tex.z-dn.net/?f=+%5Cfrac%7B48%7D%7B3%2A8%7D+%3D+-2)
Darknight (Sunny Storm)
5,4х+7,3=-3,5
5,4х=-3,5-7,3
5,4х=-10,8
х= - 2
2) 2700х^3y^y.
4)2/3x^3y^2z.
6)-3/7x^7y^15.
О,Ваше задание решено!Ответ во вложении!!!
cos2x - 3·√3 · cosx + 4 ≥ 0