x²-3x+1=0x²=3x-1分式x四次方+x²+1分之x²=x^2/(x^4+x^2+1)=x^2/(x^2(x^2+1)+1)=x^2/((3x-1)(3x-1+1)+1)=x^2/(9x^2-3x+1)=x^2/(9(3x-1)-3x+1)=x^2/(27x-9-3x+1)=x^2/(24x-8)=3x-1/8(3x-1)=1/8...