tolong pakai caranya yaa nomer 38, kalau 39 bisa ya sekalian hehe. Makasih :)

38.

√(81√(81 √81 √81...) = 3ˣ
x = 4
(lihat lampiran)

39)
6,90 : (3/10 x 27%) x 3,75% =
= (69/10) : (3/10 x 27/100) x (375/100)
=(69 /10) : (51/1000) x (375/100)
= (69/10 x (1000/51) x(375/100)
= (69 x 375)/(51)