Ответ:
(5/7 + 7/13)/2
5/7 +7/13 = 65/91 + 49/91 = 114/91
114/92 / 2 = 57/91
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Ответ:
(5/7 + 7/13)/2
5/7 +7/13 = 65/91 + 49/91 = 114/91
114/92 / 2 = 57/91