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3 3/8 + 1,2=3 3/8 +1 1/5=3 15/40+ 1 8/40=4 23/40 - II liczba
4 23/40 + 1 8/40=5 31/40 III liczba
5 31/40+ 1 8/40=6 39/40
3 15/40 +4 23/40 +5 31/40+ 6 39/40 =18 108/40=20 28/40 =20,7 suma czterech liczb