Jawabanmu

2014-03-30T10:43:51+07:00
2 . 81 akar 4 = 2 . 3 = 6
16 pangkat -1 = 1/16
maka 6 . 1/16 . 20 = 7,5 semoga benar
2014-03-30T10:47:27+07:00
81=3^4 jadi akar^4 (81)=3....2*3*1/16*20=15/2=7, 5