tolong jawab no 15 16 17 18

15) ( 3 / 2x ) - ( y+1 / 3xy )

= 3( 3xy ) - 2x ( y + 1 )
--------------------------------
( 2x )( 3xy )

= 9xy - 2xy - 2x
-------------------------
6x²y

= 7xy - 2x
----------------
6x²y

= x ( 7y - 2)
-------------------
x ( 6xy )

= 7y - 2
-------------
6xy

( B )


16) ( 3 /pq ) × ( 4p / p+1 )

= 3 × 4p
------------------
( pq )( p + 1)

= 12p
--------------
p²q + pq

= p ( 12 )
----------------
p ( pq + q )

= 12
--------------
pq + q

( C )

17) ( x / 2 ) ÷ ( x / 8 )

= x • 8
-----------
x • 2

= 8x
--------
2x

= 2x ( 4 )
-------------
2x

= 4 ( D )

18) ( 8 / x+2 ) ÷ ( 7 / 2x+4 )

= 8 ( 2x + 4 )
-------------------
7 ( x + 2)

= 8 • 2 ( x + 2 )
-----------------------
7 ( x + 2 )

= 16
--------
7

= 2 2/7 ( A )