Х-х^2-1+x+2x^2+2x-x-1=0
x^2+3x-2=0
D=3^2-4*1*(-2)=17
x1=(-3+√17)/2
x2=(-3-√17)/2
10y^2+2y-5y-2=9y^2-1
y^2-3y-1=0
D=(-3)^2-4*1*(-1)=9+4=13
y1=(-(-3)+√13)/2
y1=(3+√13)/2
y2=(3-√13)/2
6x-3x^2=12-9x+4x-3x^2
11x=12
x=12/11
2-x^2+1=3-x^2=3-(-3)^2=3-9=-6
5-4+x^2=1+x^2=1+(-3)^2=1+9=10