2
1 2/3*3 3/5+2 8/9:19 1/2=5/3*18/5+26/9*2/39=6+4/27=6 4/27
3
1 13/55:1 1/33:24/25-0,35=68/55*33/34*25/24-0,35=5/4-0,35=
=1,25-0,35=0,9
4
2 1/22*2 17/30:1 5/16-3,99=45/22*77/30*16/21-3 99=4-3,99=0,01
1
2 18/31*12 2/5-2 3/4:4 5/7=80/31*62/5-11/4*7/33=32-7/12=31 5/12