Предмет: Математика, автор: Sleshgame

По второй дроби нужно вычислить значение первой. Даю 20 баллов

Приложения:

Ответы

Автор ответа: lalakuQQ

Ответ:

$\frac{x + y}{x} = 3 \\ x + y = 3x \\ y = 2x$

подставляем вместо y в первую дробь - 2x

получится

$\frac{2 {x}^{2} + 3 \times (2 {x}) {}^{2} }{ {x}^{2} } = \frac{2 {x}^{2} + 12 {x}^{2} }{ {x}^{2} } = \frac{ {x}^{2} (2 + 12)}{x {}^{2} } = 14$

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