先化简再求值(a-1)/(a2-2a+1)+(a+1)/(a2-1),其中a=2快啊!_数学解答

先化简再求值(a-1)/(a2-2a+1)+(a+1)/(a2-1),其中a=2
快啊!

人气：397 ℃　时间：2020-03-26 20:37:26

解答

=(a-1)/(a-1)^2 +(a+1)/(a+1)(a-1) //
=1/(a-1) + 1/(a-1)
=2/(a-1)
=2/(2-1) 把a=2代入
=2