Ответы на вопрос:
(20-а) - 6 7/18 = 3 17/18 20- а = 3 17/18 + 6 7/18 20 -а = 10 6/18 а=20 - 10 6/18 а= 9 12/18 а= 9 2/3 (20 - 9 2/3 ) - 6 7/18 = 3 17/18 (20 - 9 12/18) - 6 7/18 = 3 17/18 10 6/18 - 6 7/18 = 3 17/18 186/18 - 115/18 = 3 17/18 71/18 = 3 17/18 3 17/18 = 3 17/18
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