Ответы на вопрос:
13/18 + 7/12 = (13*2)/(18*2) + (7*3)/(12*3) = = 26/36 + 21/36 = (26+21)/ 36 = 47/36 = 1 целая 11/36 5/7 - 3/5 = (5*5) /(7*5) - (3*7)/(5*7) = = 25/35 - 21/35 = (25-21)/35 = 4/35 5/6 - 3/8 - 1/12 = (5*4)/(6*4) - (3*3)/(8*3) - (1*2)/(12*2)= = 20/24 - 9/24 - 2/24 = (20-9-2)/24 = 9/24 = = (9: 3)/(24: 3) = 3/8
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