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319
32-3125=-3093
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2*5do potegi6-5do potegi5
policzmy najpierw licznik
(5⁸-3*5⁶)/2⅕=5⁶(5²-3)/2⅕=15625*22/2⅕=343750/2⅕=156250
mianownik
2*5⁶-5⁵=5⁵(5-1)=5⁵*4=
156250/5⁵*4=156250/12500=12.5