Решите уравнение: 3/7 : к = 5 : 2 1/3; 2) к : 5/9 = 1,8 : 6; 3) 5,5 : 8 = к : 2/11; 4) 20 : 3,25 = 4/13 : к. Найдите у из пропорций; 1) 11у/20 = 16 : 80; 2) 5,1 : 8,7 = 34у/29; 3) 7,2 : 2,7 = 32у/3
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