bentuk sederhana dari

1) (a.a.b)(a.a.b)(a.a.b).(1/a.a.b.b.b.b)
=a.a.a.a/b
=(a^3b^-1)
2) (√20-√2)/2√18
=(2√5-√2)/6√2
=(2√10-2)/12
=(√10-1)/6
3) 3log5 . 5log7 . 7log9
= 3log7 . 7log9
= 3log 9
= 2 semoga bermanfaat