Яка з наведених рівностей є пропорцією?
А) 16 : 3 = 18 : 4; Б) 1/3: 4 =1/2 : 9; В) 2 1/2: 2 =2 1/2 : 3; Г) 14 : 1,6 = 18 : 2,1.
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