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rozwiązanie :
2/5 + 12/15 = 1,2
obliczenia :
2/5 + 12/15 = 1 i 2/10
12/30 + 24/30 = 1 i 2/10
36/30 = 1 i 2/10
1 i 6/30 = 1 i 2/10
1 i 2/10 = 1 i 2/10
1,2 = 1,2