3/5 - 3/5 : 1/5 = 3/5 - 3/5 × 5 = 3/5 - 3 = ( 3 - 15 )/5 = - 12/5
3 / 5 - 3 / 5 : 1 / 5 =
3 / 5 - 3 / 5 × 5 / 1 =
3 / 5 - 15 / 5 =
- 12 / 5
