Ta có : `1 1/3+ 1 1/8+ 1 1/15+ 1 1/24+ 1 1/35`
`=(1+1+1+1+1)+(1/3+1/8+1/15+1/24+1/35)`
`=5+(3+3/8+1/5+1/8+1/35)`
`=5+[3+(3/8+1/8)+(1/5+1/35)]`
`=5+[3+1/2+(7/35+1/35)]`
`=5+(7/2+8/35)`
`=5+(245/70+16/70)`
`=5+261/70`
`=611/70`
`=>` Không có đáp án đúng