no 11-15 donk yang tahu

nyampe no 12 dulu ya....

11. = 4/5+5/3
= 12/15+25/15
= 37/15
= 2 7/15

12. = 15/16+43/10
=150/60+258/60
=408/60
=6 48/60
=6 4/5

13. =22/9+5/6
=44/18+15/18
=59/18
=3 5/18

14. = 12/20-5/20
=7/20

15. = 34/10+10/8
=136/40+50/40
=186/40
=4 26/40
=4 13/20