`33,76 + 19,52 + 6,24`
`= ( 33.76 + 6,24) + 19,52`
`= 40 + 19,52`
`= 59.52`
---------------------------------------------
`32,79+ 68.79`
`= ( 32 + 0,79) + ( 68 + 0,79)`
`= ( 32 + 68) + ( 0,79 + 0,79)`
`= 100 + 1,58`
`= 101,58`
-----------------------------------------------------
`8/11 + (16/13+ 3/11)`
`= 8/11 + 16/13 + 3/11`
`= ( 8/11 + 3/11) + 16/13`
`= 1 + 16/13`
`= 13/13 + 16/13`
`= 29/13`
-----------------------------------------------------
`3/5 : 3/4 - 1/5`
`= 3/5 . 4/3 - 1/5`
`= \frac{3.4}{5.3} - 1/5`
`= 4/5 - 1/5`
`= 3/5`