disederhanakan, tolong bgtt yaa plieesss jawab besok dikumpulin

1. 21/7+87/10
210/70+609/70
819/70=117/10
2. 53/10+61/9
477/90+610/90
1087/90=36/30
3. 15/2+43/8
120/16+86/16
206/16=103/8

sorry klo slh
smg membantu