Валентина , ответ добавлен 10.09.2017 в 18:49

(2 : 3 1/5 + (3 1/4 : 13) : 2/3 + (2 5/18 - 17/36) * 18/65) * 1/3 = 0,5
1) 3 1/4 : 13 = 13/4 * 1/13 = 1/4
2) 2 5/18 - 17/36 = 41/18 - 17/36 = (82 - 17)/36 = 65/36
3) 2 : 3 1/5 = 2 : 16/5 = 2/1 * 5/16 = 5/8
4) 1/4 : 2/3 = 1/4 * 3/2 = 3/8
5) 65/36 * 18/65 = 1/2
6) 5/8 + 3/8 = 8/8 = 1
7) 1 + 1/2 = 2/2 + 1/2 = 3/2
8) 3/2 * 1/3 = 1/2 = 0,5

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