x^4-x^2+6x-8=1
x^4-x^2+6x-9=0
x^4-(x^2-6x+9)=0
x^4-(x-3)^2=0
(x^2-x+3)(x^2+x-3)=0
则x^-x+3=0,此方程无实数解
或x^+x-3=0,解得x=(-1±√13)/2
代入x/(x+1)并化简得x/(x+1)=(7±√13)/6
x^4-x^2+6x-8=1
x^4-x^2+6x-9=0
x^4-(x^2-6x+9)=0
x^4-(x-3)^2=0
(x^2-x+3)(x^2+x-3)=0
则x^-x+3=0,此方程无实数解
或x^+x-3=0,解得x=(-1±√13)/2
代入x/(x+1)并化简得x/(x+1)=(7±√13)/6