`73 + 146 + 127 + 36`
`= ( 73 + 127) + ( 146 + 36)`
`= 200 +182`
`=382`
-----------------------------------------
`14,13 + 8,4 + 12,87 +3,6`
`= ( 14,13 + 12,87) + ( 8,4 + 3,6)`
`=27 + 12`
`=39`
------------------------------------------
`2/3 xx 8/17 + 2/3 xx 5/17 + 2/3 xx 4/7`
`= 2/3 xx ( 8/17 + 5/17 + 4/7)`
`=2/3 xx 159/119`
`=106/119`