20 ! сколько будет : 4-1/6 3-2/7 1 6/11- 7/11 6 6/13-5 11/13 1 5/7-6/7 1 6/11-7/11 9 3/13-7 9/13 1 8/13-9/13 7 3/11-6 5/11 7 2/7- 3 4/7 7 5/9- 6 7/9 1 3/5-4/5 5 9/17+ 7 12/17 3 12/17+2 6/17 6 8/9+7 5/9 5/7+3 6/7 2 15/19+1 5/19 5-5/11 6-4 9/10 1 4/9-5/9 5 9/17+7 12/17

4-1/6=3 5/5
3-2/7=2 5/7
1 6/11- 7/11=17/11-7/11=10/11
6 6/13-5 11/13=19/13-11/13=8/13
1 5/7-6/7=12/7-6/7=6/7
1 6/11-7/11=17/11-7/11=10/11
9 3/13-7 9/13=120/13-100/13=20/13=1 7/13
1 8/13-9/13=21/13-9/13=12/13
7 3/11-6 5/11=80/11-71/11=9/11
7 2/7- 3 4/7=51/7-25/7=26/7=3 5/7
7 5/9- 6 7/9=68/9-61/9=7/9
1 3/5-4/5=8/5-4/5=4/5
5 9/17+ 7 12/17=94/17+131/17=225/17=13 4/17
3 12/17+2 6/17=63/17+40=103/17=6 1/17
6 8/9+7 5/9=62/9+68/9=130/9=14 4/9
5/7+3 6/7=5/7+27/7=32/7=4 4/7
2 15/19+1 5/19=53/19+24/19=77/19=4 1/19
5-5/11=4 6/11
6-4 9/10=1 1/10
1 4/9-5/9=13/9-5/9=8/9
5 9/17+7 12/17=9 21/17=10 4/17