<span>{x^2+y^2=17
{х-у=5 => y=x-5
x^2+(x-5)^2=17
x^2+(x^2-10x+25)=17
2x^2-10x+8=0
D=-10^2-4*2*8=36
x</span>₁=(10-√36)/2*2
x₂=(10+√36)/2*2
x₁=1
x₂=4
y₁=-4
y₂=-1
Точки пересечения: (1;-4), (4;-1)
8(3x+y)^2-12x(6x+4y)=8(9x^2+6ху+y^2)-72x^2-48хy=72x^2+48ху+8y^2-72x^2-48хy=8y^2
А) 3х-9х^2+1-3х+9х^2+12х=19
12х=18
х=18/12
Х=1,5