Ответы на вопрос:
5/7 * (21/20 - х) + 16/21 : 8/7 = 1 1/4 5/7 * (21/20 - х) + 16/21 * 7/8 = 5/4 5/7 * (21/20 - х) + 112/168 = 5/4 5/7 * (21/20 - х) + 14/21 = 5/4 5/7 * (21/20 - х) + 2/3 = 5/4 5/7 * (21/20 - х) = 5/4 - 2/3 5/7 * (21/20 - х) = 15/12 - 8/12 5/7 * (21/20 - х) = 7/12 21/20 - х = 7/12 : 5/7 21/20- х = 7/12 * 7/5 21/20 - х = 49/60 - х = 49/60 - 21/20 - х = 49/60 - 63/60 - х = - 14/60 х = 14/60 х = 7/30 проверка: 5/7 * (21/20 - 7/30) + 16/21 : 8/7 = 1 1/4 5/7 * (63/60 - 14/60) + 16/21 * 7/8 = 1 1/4 5/7 * 49/60 + 112/168 = 1 1/4 245/420 + 14/21 = 1 1/4 49/84 + 56/84 = 1 1/4 105/84 = 1 1/4 1 21/84 = 1 1/4 1 1/4 = 1 1/4
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