Ответы на вопрос:
5) 3 1/9 * 3/8 = 28/9 * 3/8 = 7/3 * 1/2 = 7/6
6) 9 1/7 * 3/4 = 64/7 * 3/4 = 16/7 * 3/1 = 48/7
7) 10 1/5 * 10/17 = 51/5 * 10/17 = 3/1 * 2/1 = 3 * 2 = 6
8) 3/11 * 5 1/2 = 3/11 * 11/2 = 3/1 * 1/2 = 3 * 1/2 = 3/2
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