yg nomer 3,5,7,8 cara ngerjain nya gimana ,sama jawabannya

3) ( 3 / x+1 ) + ( 3 / x-1 )

= 3(x - 1) + 3 ( x + 1)
-----------------------------
( x + 1 )( x - 1)

= 3x - 3 + 3x + 3
--------------------------
x² - 1

= 6x
--------
x² - 1

5) ( 4a / 3x ) - ( 4 / 2x )

= 4a ( 2x ) - 4 ( 3x )
-----------------------------
( 3x ) ( 2x )

= 8ax - 12x
----------------
6x²

= 2x ( 4a - 3)
------------------
2x ( 3x )

= 4a - 3
-------------
3x

7) ( 3x / 2x ) • ( x-4 / 6x )

= ( 3x ) ( x - 4)
----------------------
( 2x ) ( 6x )

= 3x² - 12x
------------------
12x²

= 3x ( x - 4 )
------------------
3x ( 4x )

= x - 4
-------------
4x

8) ( ab² / c ) ÷ ( b / ac )

= ( ab²) × ( ac )
----------------------
( c ) × ( b )

= ( ab ) × ( a )

= a²b

Maaf kalau salah:)
Semoga bermanfaat:D