`17/(2.4)-17/(4.6)-...-17/(100.102)`
`=-(17/(2.4)+17/(4.6)+...+17/(100.102))`
`=-17/2(2/(2.4)+2/(.4.6)+...+2/(100.102))`
`=-17/2(1/2-1/4+1/4-1/6+...+1/100-1/102)`
`=-17/2[1/2+(-1/4+1/4)+...+(-1/100+1/100)-1/102]`
`=-17/2(1/2-1/102)`
`=-17/2.25/51`
`=-25/6`
$\text{@ThanhTruc2008}$