若x²-x-2=0,则(x²-x)-1+根号3分之x²-x+2倍根号3的值为?

问题描述:

若x²-x-2=0,则(x²-x)-1+根号3分之x²-x+2倍根号3的值为?
分母打错了,(x²-x)²-1+根号3 (分母) x²-x+2倍根号3 (分子) 2倍根号3/3

[x²-x+2√3]/[(x²-x)²-1+√3]
=[x²-x-2+2+2√3]/[(x²-x-2+2)²-1+√3]
=[0+2+2√3]/[(0+2)²-1+√3]
=(2+2√3)/(3+√3)
去分母,同乘(3-√3)
=[(2+2√3)(3-√3)]/[(3+√3)(3-√3)]
=4√3/6
=2√3/3