У=4х-11 у=4х-11 у=4х-11 у=18-11=7
6х-2(4х-11)-13=0 6х-8х+22-13=0 2х=9 х=4,5
ответ х=4.5 у=7
5(3-4х)-(-х(3-4х))=5(3-4х)+(3-4х)
х(7х-3)-13(7х-3)
2х-1/3-3=4х
2х-4х=1/3+3
-2х=3,3
х=3,3/-2
х=-1,6
А) 3х(1-2х) = 0
х = 0 1-2х=0
х = 1/2
б) х≥0 x<0
![- x^{2} +3x +6-2x=0](https://tex.z-dn.net/?f=-+x%5E%7B2%7D+%2B3x+%2B6-2x%3D0)
![x^{2} -x-6=0](https://tex.z-dn.net/?f=+x%5E%7B2%7D+-x-6%3D0)
x = 2 x= 3 x= - 2 x= 3 - посторонний, тк х<0
Ответ: 2, 3, - 2
в)
![x*3^{x} + 5*3 ^{x} -3x-15=0](https://tex.z-dn.net/?f=+x%2A3%5E%7Bx%7D+%2B+5%2A3+%5E%7Bx%7D+-3x-15%3D0++)
![3^{x} (x+5) - 3(x+5)=0](https://tex.z-dn.net/?f=+3%5E%7Bx%7D+%28x%2B5%29+-+3%28x%2B5%29%3D0)
(x+5)(
![3^{x}-3)= 0](https://tex.z-dn.net/?f=+3%5E%7Bx%7D-3%29%3D+0+)
x+5 = 0
![3^{x}-3=0](https://tex.z-dn.net/?f=+3%5E%7Bx%7D-3%3D0+)
x = - 5
![3^{x} =3](https://tex.z-dn.net/?f=+3%5E%7Bx%7D+%3D3)
x = 1
Ответ: - 5, 1