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1/(1*3)+1/(3*5)+1/(5*7)+----1/(97*99) =1/2[1-1/3]+1/2[1/3-1/5]+…+1/2[1/97-1/99] =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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