$\\$
`C = (5 - 5/13 + 5/19 - 5/27) : (11 - 11/3 + 11/9 - 11/27)`
`-> C = (5 - 5/13 + 5/19 - 5/27)/(11 - 11/3 + 11/9 - 11/27)`
`-> C= (5 (1 - 1/13 + 1/19 - 1/27) )/(11 (1 - 1/3 + 1/9 - 1/27) )`
`-> C = (5.1)/(11.1)`
`->C=5/11`
Vậy `C=5/11`
$\\$
`D = (6/101 + 6/123 + 6/134) : (11/101 + 11/123 + 11/134)`
`-> D=(6/101 + 6/123 + 6/134)/(11/101 + 11/123 + 11/134)`
`->D=(6 (1/101 + 1/123 + 1/134) )/(11 (1/101 + 1/123 + 1/134) )`
`->D=(6.1)/(11.1)`
`->D=6/11`
Vậy `D=6/11`