a² - 16b² a - 4b
-------------- : ( --------- )
4ab 4ab
( a - 4b ) ∙ ( a + 4b ) 4ab
------------------------------- ∙ ------------- = a +4b
4ab a - 4b
5 2 5 4 ∙ 44 44 + 176 220
3 ------ + 4 ∙ 4 ----- = 3 ----- + ----------- = --------------- = --------- =
13 13 13 13 13 13
12
= 16 ------
13