tolong kerjakan latihan ini no 11 sampai 13

11. 9/2 + 4/5 + 1/5 =
= 45/10 + 8/10 + 5/10
= 45/10 + 13/10
= 58/10
= 29/5
= 5 4/5

12. 13/2 - 3/5 - 1/5 = 65/10 - 6/10 - 2/10
= 57/10
= b. 5 7/10

13. 19/2 - 3/5 + 1/4 = 190/20 - 12/20 + 5/20
= 183/20
= b. 9 3/20