tolong dijawab!!! please ni 11,13

Nomer 11 = D
Nomor 13 = A
insyaallah benar

jawab=
11. 5 8/9 - 1 1/6 - 2 1/3
= 53/9 - 7/6 - 7/3
= 106/18 - 21/18 - 42/18 = 43/18
= 2 7/18
13. a
"SEMOGA MEMBANTU"