1. 5/9 - 2/9 =3/9
2. 3/8 - 1/8 = 2/8
3. 9/10 - 7/10 = 2/10
4. (5/7 + 4/7) - 1/7 = 9/7 - 1/7 = 8/7 = 1 1/7
5. (1 - 1/8) + 5/8 = (8/8 - 1/8) + 5/8 = 7/8 + 5/8 = 12/8 = 1 4/8 = 1 1/2
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Answers & Comments
1. 5/9 - 2/9 =3/9
2. 3/8 - 1/8 = 2/8
3. 9/10 - 7/10 = 2/10
4. (5/7 + 4/7) - 1/7 = 9/7 - 1/7 = 8/7 = 1 1/7
5. (1 - 1/8) + 5/8 = (8/8 - 1/8) + 5/8 = 7/8 + 5/8 = 12/8 = 1 4/8 = 1 1/2