please bantu dengan penjelasan kak

(3+4/3)(5/6+8/9)
------------------------
(2/5-1/3)(2/9-1/6)

(9/3+4/3)(15/18+16/18)
--------------------------------
(6/15-5/15)(4/18-3/18)

11/3 . 31/18
---------------
1/15 . 1/18

11/3 . 31/18 . 15/1 . 18/1

11 . 31 . 5

1705