Ответы на вопрос:
1. 2 10/13-4/9*2 10/13= 2 10/13 - 4/9 * 36/13= 2 10/13 - 4/9 *9*4/13 = 2 10/13 - 4*4/13 = 2 10/13 - 16/13 = 36/13 - 16/13 = 20/13 = 1 7/13 2. 1/6 *2 10/13 = 1/6 * 36/13 = 1/6 * 6*6/13 = 6/13
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