`a)`
`|-3 1/2| + |2/5| - |1 1/4|`
`= 7/2 + 2/5 - 5/4`
`= 70/20 + 8/20 - 25/20`
`= 53/20`
`b)`
`|-1,2| - |-3,6| + |-2,4|`
`= 1,2 - 3,6 + 2,4`
`= 0`
`c)`
`|3/5| - |-0,15| + |1 3/5|`
`= 3/5 - 3/20 + 8/5`
`= 44/20 - 3/20`
`= 41/20`
`d)`
`-|4,62| - |3,61| - |(-1)/5|`
`= -4,62 - 3,61 - 1/5`
`= -8,23 - 0,2`
`= -8,43`