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licznik:
12*5^2n * 5 - 8*5^2n + 4*5^2n * 1/5 = 5^2n(12*5-8+4*1/5)
mianownik:
4*5^2n*1/25 = 4*5^2n*1/25
skracasz 5^2n i dalej to juz prościutkie obliczenia.
5^2n = 5 do potęgi 2n