Jawabanmu

2014-07-17T20:50:42+07:00
U2/u1 = r
x/x/x-1 = 2
x  = x/x-1 . (2)
x = 2x/x-1
x²-x = 2x
x² - x - 2x = 0
x² - 3x = 0
(x-3) ( x-0) = 0 

x= 3
trimakasih kak, jwabannya PAS .. (Y)
sip kaka