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!](/uploads/image/z/2507727-39-7.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%E5%86%8D%E6%B1%82%E5%80%BC%28a-1%29%2F%28a2-2a%2B1%29%2B%28a%2B1%29%2F%28a2-1%29%2C%E5%85%B6%E4%B8%ADa%3D2%E5%BF%AB%E5%95%8A%21)
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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)/(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