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1/x(x+1)+1/(x+1)(x+2)+...+1/(x+999)(x+1000)=?1/x(x+1)+1/(x+1)(x+2)+...+1/(x+999)(x+1000)等于多少,"/"代表分之,第一个就是x(x+1)分之1,说的好了多加分,

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