- ( 7 2 / 7 ) 2 2 / 3 4 3 / 7 - ( - 4 - 1 / 4)
= - 7 - 2 / 7 6 2 / 3 3 / 7 4 1 / 4
= - 7 6 4 - 2 / 7 3 / 7 2 / 3 1 / 4
= 3 1 / 7 8 / 12 3 / 12
= 3 1 / 7 11 / 12
= 3 12 / 84 77 / 84
= 3 89 / 84
= 4 5 / 84
0
- ( 7 2 / 7 ) 2 2 / 3 4 3 / 7 - ( - 4 - 1 / 4)
= - 7 - 2 / 7 6 2 / 3 3 / 7 4 1 / 4
= - 7 6 4 - 2 / 7 3 / 7 2 / 3 1 / 4
= 3 1 / 7 8 / 12 3 / 12
= 3 1 / 7 11 / 12
= 3 12 / 84 77 / 84
= 3 89 / 84
= 4 5 / 84