Question

1) 2/3
———— +1/20=4/5
4/9х-4/9

Answer 1

Ответ:

$x = \frac{1}{3}$

Решение:

$\frac{ \frac{2}{3} }{ \frac{4}{9x} - \frac{4}{9} } + \frac{1}{20} = \frac{4}{5}$

$\frac{ \frac{2}{3} }{ \frac{4 - 4}{9x} } + \frac{1}{20} = \frac{4}{5}$

$\frac{6x}{4 - 4x} + \frac{1}{20} = \frac{4}{5}$

$\frac{3x}{2 - 2x} = \frac{4}{5} - \frac{1}{20}$

$\frac{3x}{2 - 2x} = \frac{3}{4}$

$12x = 6 - 6x$

$18x = 6$

$x = \frac{1}{3}$