Сравнить дроби: 0,4 и 1/3 2 2\9 и 2 5/21

6/3 : 3 = 6/3 * 1/3 = 6/9 = 2/3

9/6 : 3 = 9/6 * 1/3 = 3/6 * 1/1 = 3/6 = 1/2

15/9 : 3 = 15/9 * 1/3 = 5/9

21/33 : 3 = 21/33 * 1/3 = 7/33

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14/21 = 2/3

10/18 = 5/9

17/51 = 1/3

15/18 = 5/6