Ответы на вопрос:
1. = 1 7/12: (9/24+10/24) = 1 7/12: 19/24 = 19/12*24/19 = 2 2. =17/36: ( 21/36-20/36 ) = 17/36: 1/36 = 17/36*36/1 = 17 3. = ( 3/14+10/14): 26/7 = 13/14: 26/7 = 13/14*7/26 = 1/4 4. = 19/24: (9/48+10/48) = 19/24: 19/48 = 19/24*48/19 = 2
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