2(1)/(3)k=4(1)/(2)*1(1)/(9);
8(1)/(2)m=3(2)/(3)*1(1)/(11);
y-:(4)/(5)=3(1)/(8)-:1(1)/(4);
z-:(3)/(14)=3(1)/(9)-:(4)/(9);

Ответ:

1. 1/9+4/9=5/9

2. 7/8-3/8=4/8=1/2

3. 15/19-6/19=9/19

4. 5/16+1/16=6/16=3/8

5. 3/14+11/14=14/14=1

6. 11/21+4/21=15/21=5/7

Объяснение: