√a- 1+(ab-2)^2=0
∴a= 1,b=2
∴ Original formula =1/(1* 2)+1(2 * 3)+1(3 * 4)+..+1/(2005 * 2000)
= 1- 1/2+ 1/2- 1/3+ 1/3- 1/4+...+ 1/2005- 1/2006
= 1- 1/2006
=2005/2006
If anyone plagiarizes my answer, I will kill you on behalf of the moon! )
P s: √ stands for root number; * stands for multiplication symbol; 2 represents the square.
thank you
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