Question

Решите уравнение:1) х+3/65 = 4/132) 7/х+4 = 21/603) 5х-8/5 = 18/45

Answer 1

$x+ \frac{3}{65}= \frac{4}{13}$
$x= \frac{4}{13}- \frac{3}{65}$
$\frac{4}{13}- \frac{3}{65}= \frac{20-3}{65} = \frac{17}{65}$
$x= \frac{17}{65}$

$\frac{7}{x+4} = \frac{21}{60}$
$\frac{7}{x+4}= \frac{7}{20}$
$\frac{1}{x+4}= \frac{1}{20}$
$x+4=20$
$x=20-4$
$x=16$


$5x- \frac{8}{5}= \frac{18}{45}$
$5x= \frac{18}{45}+ \frac{8}{5}$
$5x= \frac{90}{45}$
$x= \frac{90}{45}/5$
$x= \frac{2}{5}$