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odwrotność to 3/25
3 1/5 = 16/5
odwrotność to 5/16
3/25 + 5/16 = 48/400 + 125/400 = 173/400
3 1/5 = 16/5 , odwrotność = 5/16
wspólny mianownik 400
(3*16)/400 + (5*25)/400=48/400+125/400=173/400