tolong pakai cara ya....

1) (5 / 2x) + (3 / 2x)
= 8 / 2x
= 4 / x

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

= 3x - 9 + 2x + 4
------------------------
(x + 2)(x - 3)

= 5x - 5
------------
x² - x - 6

3) 4(x - 1) - 5(x + 3)
-----------------------------
(x - 1)(x + 3)

= 4x - 4 - 5x - 15
--------------------------
(x - 1)(x + 3)

= - x - 19
--------------------
x² + 2x - 3

4) 2a (2x - 6xy)
-------------------------
3x . 12a

= 2x - 6xy
---------------
3x . 6

= 2x (1 - 3y)
------------------
18x

= 1 - 3y
-----------
9x