podpunkt b i c reszta nie daje naj prosze szybko.

(1 i 4/9 - 5/6) : (1 i 7/18 - 5/6) = (1 i 8/18 - 15/18) : ( 1 i 7/18 - 15/18 ) = (26/18 - 15/18) : (25/18 - 15/18) = 11/18 : 10/18 = 11/18 * 18/10 = 11/10 = 1 i 1/10 1/13 * 2/3 : (11/13 + 2/3 ) = 1/13 * 2/3 : (33/39 + 26/39) = 2/39 : 56/39 = 2/39 * 39/56 = 1/28