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)

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

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

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

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

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