1).6/8 - 2/12 - 1/4 : 2).7/10 - 1/4 - 1/5 : 3).5 3/4 - 2 1/8 - 1 1/2 : 4).6 2/3 - 2 1/6 - 1/9 : 5).7 7/5 - 2/6 - 2 1/3 :

1. 18/24+4/24+6/24=28/24 ( 7/6)
2. 14/20+5/20+4/20 = 23/20
3. 23/4+17/8+3/2 = 46/8 + 17/8 + 12/8 = 65/8
4. 20/3+13/6+1/9 = 120/18+39/18+2/18 = 161/18
5. 42/5+2/6+7/3 = 252/30+10/30+70/30= 332/30

1. 6/8-2/12-1/4
= 3/4-1/6-1/4
= 9/12-2/12-3/12
= 4/12
= 1/3

2. 7/10-1/4-1/5
= 14/20-5/20-4/20
= 5/20
= 1/4

3. 5 3/4- 2 1/8- 1 1/2
= 15/4- 1/4- 1/2
= 3

4.6 2/3- 2 1/6- 1/9
= 2×2 - 2/3 - 1/9
= 4 - 2/3 - 1/9
= 32/9
= 3 5/9

5. 7 7/5- 2/6 - 2 1/3
= 49/5 - 2/6- 2/3
= 44/5
= 8 4/5