9,,,,11,,,,13...перекладите пожалусто сами
9. x^2=t t^2-2t-3=0 t>=0 t=3 x=+-sqrt(3) 11. ((2x-3)/(x-2)^2-(x-1)/*(x(x-2)))*(x^2-4)*x/(x^2-2)= =(x^2-2)(x^2-4)x/(x(x^-2)^2(x^2-2))=(x^2-2)(x^2+2)/(x^2-2)(x-2)=(x^2+2)/(x-2) 13 y=4x-3 2x^2+(4x-3)^2=3 18x^2-24x+6=0 3x^2-4x+1=0 x=1 x2=1/3 y=1 y2=-5/3