tolong jawab no 12 dan 13 isi cara

12) 3 3/4 - 5/6
= 15/4 - 5/6
= 45/12 - 10/12
= 35/12
= 2 11/12
jawaban C

13) 12 1/2 + 5 3/4 + 8 5/6
= (12+5+8) + (1/2+3/4+5/6)
= 25 + (6/12 + 9/12 + 10/12)
= 25 + 25/12
= 25 + 2 1/12
= 27 1/12
jawaban C