jawab No 15 - 20 #Kalau Asal asalan D o s a

15. 17/24 - ( 7/24× 2/24 )
= 17/24 - 14/24
= 3/24

16. 3/4 -2/3 +1/6
= 9/12 - 8/12 + 2/12
= 1/12 + 2/12
= 3/12 = 1/4 ( D )

17. 1/3 - 1/7 + 15/21
= 7/21 - 3/21 + 15/21
= 4/21 + 15/21
= 19/21 ( A )

18. 11/12 - 6/12 - 3/12
= 5/12 - 3/12
= 2/12 = 1/6 ( B )

19. 3/4 - 1/2
= 3/4 - 2/4
= 1/4

1/2 - 1/4
= 2/4 - 1/4
= 1/4 ( B )

20. 1- 1/3 + 3/8
= 24/24 - 8/24 + 9/24
=24/24 - 17/24
= 7/24 ( C )

Semoga bermanfaat (≧∇≦)/（⌒▽⌒）“ψ(｀∇´)ψ