1. 1: 3/8 2. 1-3/8 3. 1+3/8 4. 5-4целых 1/5 5. 5+4целых 2/5 6. 5*2целых 2/5 7. 5: 4целых 1/5 8. 4-1целая 1/2 9. 1целая 1/2: 1/4 10. 1целая 1/2+4

1)
1:3/8=1·8/3=8/3=2 2/3
2)
1-3/8=8/8-3/8=5/8
3)
1+3/8=8/8+3/8=11/8=1 3/8
4)
5-4 1/5=(5-4)-1/5=1-1/5=5/5-1/5=4/5
5)
5+4 2/5=(5+4)+2/5=9+2/5=9 2/5
6)
5·2 2/5=5·12/5=12
7)
5:4 1/5=5:21/5=5·5/21=25/21=1 4/21
8)
4-1 1/2=(4-1)-1/2=3-1/2=2+1-1/2=2+1/2=2 1/2
9)
1 1/2:1/4=3/2:1/4=3/2·4/1=12/2=6