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

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

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

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