Ответы на вопрос:
72/90=12/15 ; 33/39 = 11/13 ; 45/51 = 15/21 ; 12/60=1/5 ; 50/100 = 1/2
89/26 - z = 5 7/39 8 27/78 - z = 5 14/78 z = 8 27/78 - 5 14/78 z = 3 13/78 ответ: 3 13/78
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