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a - jeden bok = 5/12 m
b - drugi bok = 1/3 m
c - trzeci bok = 1 m - (5/12 m + 1/3 m) = 1 - (5/12 m + 4/12 m) = 1 m - 9/12 m = = 3/12 m = 1/4 m
PS.(12/12, 1/3 itp. to ulamki zwykle)