2小时内满分题）若√a-1 +√ab-2 =0,求1／ab+1/(a+1)(b-1)+1/(a+2)(b-2)+…+1/(a+2004)(b+2004)的值.我可以由√a-1 +√ab-2 =0算出a=1 ,ab=2即b=2,但是代入去算就不会!

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