Tính: `D=(10*(2/5-1/2)-1/3:(1+3/5))/((1/2+2/3-3/4):(5/2+7/6)-1)`

`D = (10.(2/5 - 1/2)-1/3 : (1+3/5))/((1/2+2/3-3/4) : (5/2 + 7/6) -1)`

`=> D = (10 . (-1)/10 - 1/3 : 8/5)/((7/6 - 3/4) : 11/3 - 1)`

`=> D = (-1 - 1/3 . 5/8)/(5/12 . 3/11 - 1)`

`=> D = (-1 - 5/24)/(5/44 - 1)`

`=> D = ((-29)/24)/((-39)/44)`

`=> D = (-29)/24 : (-39)/44`

`=> D = 319/234`

Vậy `D=319/234`

`#dtkc`