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