Question

помогите пожалуйста срочно​

Answer 1

$\frac{30}{1 + \frac{10}{3 - \frac{7}{4 + \frac{9}{x} } } } - 4.5 = 0.5 \\ \\ \\ \frac{30}{1 + \frac{10}{3 - \frac{7}{4 + \frac{9}{x} } } } = 5 \\ \\ \\ 30 = 5 \times (1 + \frac{10}{3 - \frac{7}{4 + \frac{9}{x} } } ) \\ \\ 6 = 1 + \frac{10}{3 - \frac{7}{ \frac{4x + 9}{x} } } \\ \\ 5 = \frac{10}{3 - \frac{7x}{4x + 9} } \\ \\ 10 = 5(3 - \frac{7x}{4x + 9} ) \\ \\ 2 = 3 - \frac{7x}{4x + 9} \\ \\ - 1 = - \frac{7x}{4x + 9} \\ \\ 7x = 4x + 9 \\ \\ 3x = 9 \\ \\ x = 3$

Ответ. С