Ответы на вопрос:
3/4 - 2/7 = (3 × 7 - 2 × 4)/28 = 21/28 - 8/28 = 13/28 1/2 + 3/7 = (1 × 7 + 3 × 2)/14 = 7/14 + 6/14 = 13/14 2/9 + 3/7 = (2 × 7 + 3 × 9)/63 = 14/63 + 27/63 = 41/63 8/9 - 1/2 = (8 × 2 - 1 × 9)/18 = 16/18 - 9/18 = 7/18
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