Ответы на вопрос:
A/b = 6/7 => 7a = 27b => a = 27b/7 (a+3b) / a - ? 7a = 27b | -6a a = 27b - 6a | +3b a+3b = 30b - 6a |: a (a+3b)/a = (30b-6a) / a (a+3b)/a = (30b - 6*27b/7) : 27b/7 (a+3b)/a = (30b-23_1/7 b) * 7/(27b) (a+3b)/a = 6_6/7 b * 7/(27b) (a+3b)/a = 48b/7 * 7/(27b) (a+3b)/a = 48/27 (a+3b)/a = 16/9
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