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1/2 + 3/5 = 5/10 + 6/10 = 11/10 = 1,1 - wspólny mianownik 10 (2*5; 5*2)
4/7 + 1/2 = 8/14 + 7/14 = 15/14 = 1 1/14 - wspólny mianownik 14 (7*2; 2*7)
23/30 + 7/12 = 46/60 + 35/60 = 81/60 = 27/20 = 1,35 - wspólny mianownik 60 (30*2; 12*5)
5/24 + 35/36 = 15/72 + 70/72 = 85/72 = 1 13/72 - wspólny mianownik 72 (24*3; 36*2)