小林和小莹一同看到一道题：当x=（5-2根号二）/3时,求代数式[(xx-2x+1)/xx-1]/[(2x-2)/(x+1)]的值.小林看完说：“这道题我们目前还不能做,因为x所取的值太复杂了.”小莹想了一会,又动手试了试,兴

Question

小林和小莹一同看到一道题：当x=（5-2根号二）/3时,求代数式[(xx-2x+1)/xx-1]/[(2x-2)/(x+1)]的值.小林看完说：“这道题我们目前还不能做,因为x所取的值太复杂了.”小莹想了一会,又动手试了试,兴奋地说：”同学们,请你解出这道题.

Answer 1

=[((x-1)(x-1))/((x+)(x-1))]/[2(x-1)/(x+1)]
=[(x-1)/(x+1)]*[(x+1)/(2(x-1))]
=1/2