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1) (28/25-4/25): (5/5-2/5)*(9 16/16-9 1/16) =24:3*15=8*15=1202) (23/23+7/23)*(1 25/25-4/25): (98 5/5-98 1/5)=30/23*(50/25-4/25): 4=30/23*46/25: 4=12/5: 4=12/5: 4/1=12/5*1/4=3/53) (21/45+23/45) *(30/22+5/22):(11 5/18пример дальше не виден