问题描述：
数学八年级下册轻巧夺冠50页第25题
1/(a-1)+1/(a-1)(a-2)+1/(a-2)(a-3)+1/(a-3)(a-4)+...+1/(a-99)(a-100)
1/(a-1)+1/(a-1)(a-2)+1/(a-2)(a-3)+1/(a-3)(a-4)+...+1/(a-99)(a-100)
问题解答：
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