4/10=2/5
8/12=2/3
6/9=2/3
9/12=3/4
2/8=1/4
3/12=1/4
10/2=5
6/30=1/5
15/60=1/4
88/33=8/3=2цел 2/3
2/100=1/50
50/100=1/2
11/12-5/12=6/12=1/2
5/14+2/14=7/14=1/2
3 7/18-1 1/18=2 6/18=2 1/3
4 6/15+3 4/15=7 10/15=7 2/3
75/90=5/6
150/120=5/4=1 1/4
140/210=2/3
330/495=22/33=2/3
5/6=20/24
11/19=33/57
12/13=60, 65
12/13=72/78