计算,化简.

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计算,化简.

计算,化简.
计算,化简.
 

计算,化简.
原式=(2008a)/(a-1)^2/(a-1+1)/(a-1)=(2008a)/(a-1)^2*(a-1)/a=2008/(a-1)

原式=2008a/(a-1)^2÷a/(a-1)
=2008a/(a-1)^2×(a-1)/a
=2008/(a1)

2008a/(a-1)²/a/a-1
=2008/(a-1)
也就是a与a划去,a-1与a-1划去