Tolong isi sma caranya dong please

12) ( 2 / x+2 ) - ( 3 / x+3 )

= 2 ( x + 3 ) - 3 ( x + 2 )
----------------------------------
( x + 2 ) ( x + 3 )

= 2x + 6 - 3x - 6
------------------------
x² + 2x + 3x + 6

= - x
---------------
x² + 5x + 6

( D )


13) ( 3ab / 2c ) ÷ ( 9b² / 4ac )

= ( 3ab ) ( 4ac )
---------------------
( 2c ) ( 9b² )

= 3b ( a ) × 2c ( 2a )
------------------------------
3b ( 3b ) × 2c

= a × 2a
-----------
3b

= 2a²
---------
3b

( A )

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