Tolong bantu jawab beserta caranya Soalnya buat besok d kumpulin Mohon bantuannya please....

18) ( 3a / 2 ) - ( 4a / 3 )
= 3 ( 3a ) - 2(4a )
---------------------------
( 2 )( 3 )
= 9a - 8a
---------------
6
= a
------
6
( A )

19) 5 ( p - q ) + a ( p - q )
= ( p - q )( 5 + a )
( C )

20) ( a - b )( a + b + 3)
= a² - ab + ab - b² + 3a - 3b
= a² - b² + 3a - 3b
= a² + 3a - 3b - b² ( D )

21) ( x+3 / 3 ) + ( x-3 / 5 )
= 5( x + 3) + 3 ( x - 3)
-------------------------------
( 3 ) ( 5 )
= 5x + 15 + 3x - 9
--------------------------
15
= 8x + 6
--------------
15
( C )

22) ( 4xy / 3z ) × ( 9xy / 10xy )
= (4xy )( 9xy)
--------------------
( 3z )( 10xy)

= 36x²y²
-------------
30xyz

= 6xy ( 6xy )
-------------------
6xy ( 5z )

= 6xy
---------
5z
( B )

23) ( abc )( abc )( abc )
----------------------------------
( bc )( ac )( ab )

= (a )( b )( c )

= abc
( C )

24) ( 4xy / 7z ) ÷ ( 6y² / 14x²y )

= ( 4xy )( 14x²y )
------------------------
( 7z )( 6y² )

= 56x³y²
--------------
42y²z

= 14y² ( 4x³ )
-------------------
14y² ( 3z )

= 4x³
---------
3z
( B )

25) K = ( 3p + 2) + ( 4p + 4 ) + ( 2p - 1)
=( 9p + 5) cm
( C )