Ответы на вопрос:
11/2 * 2 10/13 + 2 3/4 * 2 10/13 - 2 10/13 * 3 1/6 = = 2 10/13 * (1 1/2 + 2 3/4 - 3 1/6) = = 2 10/13 * (3/2 + 11/4 - 19/6) == 2 10/13 * (18/12 + 33/12 - 38/12) == 36/13 * 13/12 = 3
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