(1-1/2)加(1/2-1/3)加(1/3-1/4)加.(1/2005减1/2006)等于多少?

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(1-1/2)加(1/2-1/3)加(1/3-1/4)加.(1/2005减1/2006)等于多少?
(1-1/2)加(1/2-1/3)加(1/3-1/4)加.(1/2005减1/2006)等于多少?

(1-1/2)加(1/2-1/3)加(1/3-1/4)加.(1/2005减1/2006)等于多少?
1-1/2006=2005/2006.1-1/n

1/(n+1)n =1/n - 1/(n+1) 答案是 2005/2006