4(a-b)(a+b)/6a*1/3(2a-b)
больше нечего сделать ответ вот таки оставляем
(1/4×1/3)²×9×2^5+(1/3)^-2×6×3×2^-1=(1/12)²×9×32+9×6×3×1/2=1/144×9×32+9×3×3=2+81=83
1)
![\begin{cases}6x+y=0\\-4x+y=2\ /\cdot(-1)\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D6x%2By%3D0%5C%5C-4x%2By%3D2%5C+%2F%5Ccdot%28-1%29%5Cend%7Bcases%7D)
![\begin{cases}6x+y=0\\4x-y=-2\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D6x%2By%3D0%5C%5C4x-y%3D-2%5Cend%7Bcases%7D+)
+_____________
![10x=-2\ /:10](https://tex.z-dn.net/?f=10x%3D-2%5C+%2F%3A10)
![x=-0,2](https://tex.z-dn.net/?f=x%3D-0%2C2)
![\begin{cases}x=-0,2\\6x+y=0\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7Dx%3D-0%2C2%5C%5C6x%2By%3D0%5Cend%7Bcases%7D)
![\begin{cases}x=-0,2\\6 \cdot (-0,2)+y=0\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7Dx%3D-0%2C2%5C%5C6+%5Ccdot+%28-0%2C2%29%2By%3D0%5Cend%7Bcases%7D)
![\begin{cases}x=-0,2\\-1,2+y=0\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7Dx%3D-0%2C2%5C%5C-1%2C2%2By%3D0%5Cend%7Bcases%7D)
![\begin{cases}x=-0,2\\y=1,2\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7Dx%3D-0%2C2%5C%5Cy%3D1%2C2%5Cend%7Bcases%7D)
1 решение
2)
![\begin{cases} y+x=7\\ y=-x-5\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D+y%2Bx%3D7%5C%5C+y%3D-x-5%5Cend%7Bcases%7D+)
![\begin{cases} y+x=7\\ y+x=-5\ /\cdot(-1)\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D+y%2Bx%3D7%5C%5C+y%2Bx%3D-5%5C+%2F%5Ccdot%28-1%29%5Cend%7Bcases%7D+)
![\begin{cases} y+x=7\\ -y-x=5\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D+y%2Bx%3D7%5C%5C+-y-x%3D5%5Cend%7Bcases%7D+)
+____________________
![0=12](https://tex.z-dn.net/?f=0%3D12)
![\begin{cases} y+x=7\\ y+x=-5\ /\cdot(-1)\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D+y%2Bx%3D7%5C%5C+y%2Bx%3D-5%5C+%2F%5Ccdot%28-1%29%5Cend%7Bcases%7D+)
3)
![\begin{cases}x-y=2\ /\cdot(-3)\\3x-3y-6=0\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7Dx-y%3D2%5C+%2F%5Ccdot%28-3%29%5C%5C3x-3y-6%3D0%5Cend%7Bcases%7D)
![\begin{cases}-3x+3y=-6\\3x-3y=6\end{cases}](https://tex.z-dn.net/?f=%5Cbegin%7Bcases%7D-3x%2B3y%3D-6%5C%5C3x-3y%3D6%5Cend%7Bcases%7D)
+______________
![0=0](https://tex.z-dn.net/?f=0%3D0)
бесконечное множество решений
Отв : 1) -1/7 ; -1.
2) 2 ; 3