tolong jawab secepatnnya

12. 10 3/4 - 4 1/3 - 2 1/2
= 43/4 - 13/3 - 5/2
= 129/12 - 52/12 - 30/12
= 47/12
= 3 11/12

13. 7 1/2 x 2 16/34 x 4/5
= 15/2 x 84/34 x 4/5
= 252/17
= 14 14/17

maaf kalau salah :(