$\\$
`a,`
`5/8 - 3/8 : ( (-3)/4) - 1/4 . 0`
`= 5/8 - 3/8 . (-4)/3 - 0`
`= 5/8 - (-1)/2`
`= 5/8 + 4/8`
`= 9/8`
$\\$
`b,`
`2,5 - ( (-16)/2017)^0 + ( (-1)/3)^2 : (-3)`
`= 5/2 - 1 + 1/9 . (-1)/3`
`= 5/2 - 1 + (-1)/27`
`= 135/54 - 54/54 - 2/54`
`= 79/54`
$\\$
`c,`
`(2/99 - 3/7) : 4/7 + 7/4 . 97/99`
`= (2/99 - 3/7) . 7/4 + 7/4 . 97/99`
`= 7/4 . [2/99 - 3/7 + 97/99]`
`= 7/4 . [(2/99 + 97/99) - 3/7]`
`= 7/4 . [1 - 3/7]`
`= 7/4 . [7/7 . 3/7]`
`= 7/4 . 4/7`
`= 1`
$\\$
`d,`
`2016/2017 . (13 - 13 2016/2017) - 1/2017 : 2017/2016`
`= 2016/2017 . (13 - 13 - 2016/2017) - 1/2017 . 2016/2017`
`= 2016/2017 . (-2016)/2017 - 1/2017 . 2016/2017`
`= 2016/2017 . ( (-2016)/2017 - 1/2017)`
`= 2016/2017 . (-1)`
`= (-2016)/2017`
