Question

Помогите матем сделать !номер 317(1)

Answer 1

1317.

1)

$\frac{x - 5}{2} = \frac{9 - x}{3}$

$x - \frac{5}{2} = \frac{1}{3} ( - x + 9)$

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

2)

$\frac{8 + x}{7} = \frac{3x - 5}{6.5}$

$\frac{1}{7} (x + 8) = 3x - \frac{10}{33}$

$\frac{x}{7} + 8 = 3x - \frac{10}{33}$

3)

$\frac{7x + 9}{2.5} = \frac{5x - 2}{6}$

$7x + \frac{9}{ (\frac{5}{2}) } = 5x - \frac{1}{3}$

$7x + \frac{9}{ \frac{5}{2} } = \frac{5x - 2}{6}$

$7x = 5x + - \frac{59}{15}$

$2x = - \frac{59}{15}$

$x = - \frac{59}{15} \div 2$

$x = - \frac{59}{30}$

4)

$\frac{0.6 }{x - 3} = \frac{2.1}{x + 2}$

$- 3 + \frac{3}{5x} = 2 + \frac{21}{10x}$

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

$x = - \frac{1}{5} \div ( \frac{2}{3} )$

$x = - \frac{3}{10}$