Ответы на вопрос:
2 3/11 * 7/9 + 6 8/11 * 1 2/7 = 10 289/693,
1) 2 3/11 * 7/9 = 25/11 * 7/9 = 175/99 = 1 76/99,
2) 6 8/11 * 1 2/7 = 74/11 * 9/7 = 666/77 = 8 50/77,
3) 1 76/99 + 8 50/77 = 175/99 + 666/77 = 1225/693 + 5994/693 = 7219/693 = = 10 289/693
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