Jawabanmu

2014-02-28T21:36:56+07:00
Dimisalkan pembilang = x
 \frac{x-3}{x} =  \frac{4}{5}

4x = 5(x-3)
4x = 5x - 15
15 = 5x -4 x
x = 15
Pembilang = 15
Pembilang kuadrat = 225
Penyebut = 15-3 = 12
Penyebut kuadrat = 144

Selisih kuadrat = 225 - 144 = 81