Найдите сумму дробей

2/9+9/11
5/18+2/3
17/21+9/14
23/27+11/15

Найдите разность дробей

2/3-2/5
2/9-1/18
21/34-8/17
12/25/12/35

Щас решим

1. 2/9+9/11=22+81/99=103/99
2. 5/18+2/3=5+12/18=17/18
3. 17/21+9/14=32+27/42=61/42
4. 23/27+11/15=115+99/135=213/135
5. 2/3-2/5=10-6/15=4/15
6. 2/9-1/18=4-1/18=3/18=1/6
7. 21/34-8/17=21-16/34=5/34
8. 12/25-12/35=84-60/175=24/175