jawab no 11-15 please gak usah pake cara

11. = 13/4 + 32/5 - 1/4
= 65/20 + 128/20 - 5/20
= 188/20
= 9 8/20
= 9 2/5

12. = 10/3 x 6/8 x 3
= 10 x 3/4
= 30/4
= 7 2/4
= 7 1/2

13. 3/4 = 12/n
n = 12 x 4 x 1/3
n = 4 x 4
n = 16

14. = 45 : 40
= 9 : 8

15. = 8 x 4500
= 36000 cm
= 360 m

Jadikan terbaik ya, thanks