Jawabanmu

2014-09-10T21:09:48+07:00
27/3 ^2x-1 = 81^-0,125
9^2x-1=(9^2)^0,125
9^2x-1=9^0,25
2x-1=0,25
2x-1-0,25=0
2x-1,25=0
2x=1,25
x=0,5125
2014-09-10T21:10:31+07:00
27/3^2x-1=81^-0,125
9^2x-1=(9^2)^-0,125
9^2x-1=(9^2)^-1/8
9^2x-1=9^-1/4            (angka 9 dihilangkan karena sama)
2x-1=-1/4
2x=-1/4+1
2x=3/4
x=3/4:2
x=3/8