Jawabanmu

2014-03-31T18:34:29+07:00
A : b = 5 : 4
 \frac{a}{b} =  \frac{5}{4}
4a = 5b
a =  \frac{5}{4}b
a-b =  \frac{5}{4} b - b
     =  \frac{1}{4} b