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1/(1×3)+1/(3×5)+……+1/(97×99) =1/2×[2/(1×3)+2/(3×5)+……+2/(97×99)] =1/2×(1-1/3+1/3-1/5+……+1/97-1/99) =1/2×(1-1/99) =1/2×98/99 =49/99
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