|х^2-3х-1/х^2+х+1|lt;=3

(х-1)(х-2)=(3х+1)(х-2)<=>x^2-3x+2=3x^2-5x-2 <=> 2x^2-2x-4=0 <=>x^2-x-2=0D=1+8=9x=1+3/2x=1-3/2x=2x=-1Ответ:-1;2(х-1)(2х+3)=7 <=> 2x^2+x-3=7 <=> 2x^2+x-10=0D=1+80=81x=-1+9/4x=-1-9/4x=2x=-2.5Ответ:-2,5;2