3/4+2/5=...
2 / 15
3 / 20
2/3–1/4=...
4/5–2/3=...
3/4–2/3=...
23 / 20
17 / 20
7 / 12
2/3+3/5=...
2/3+3/4=...
3/4+1/3=...
7 / 20
17 / 12
2/3–3/5=...
1 / 12
1/4+3/5=...
1/4+1/3=...
1 / 15
5 / 12
3/4–2/5=...
19 / 15
2/5–1/4=...
13 / 12