Jawabanmu

2014-06-10T22:36:27+07:00
 \frac{ U_{2} }{ U_{1} } =  \frac{1}{a} \\  \frac{ar}{a} =  \frac{1}{a}  \\ r =  \frac{1}{a}
 S_{tak hingga} =  \frac{a}{1- r}  \\  S_{tak hingga} =  \frac{a}{1 -  \frac{1}{a} }  \\ 4a =  \frac{a}{1 -  \frac{1}{a} }  \\ 4a - 4 = a \\ 4a - a = 4 \\ 3a = 4 \\ a =  \frac{4}{3}
kebalik itu, mgkin maksudnya a = 4/3
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2014-06-10T23:40:48+07:00