Question

2x:3x на фото посмотрите крч, пожалуйсто не кратко, помогите умоляю
x-4

Answer 1

$2x \div \frac{3 {x}^{3} }{x - 4} = 2x \times \frac{(x - 4)}{ 3{x}^{3} } = \\ = 2x \times \frac{(x - 4)}{3x \times \ {x}^{2} } = 2\times \frac{(x - 4)}{3{x}^{2} } = \\ = \frac{2x - 8}{ 3{x}^{2} }$
$\frac{5x + 15}{3x - 15} \div \frac{3x + 9}{ {x }^{2} - 25} = \\ = \frac{5(x + 3)}{3(x - 5)} \times \frac{ {x }^{2} - 25}{3x + 9} = \\ =\frac{5(x + 3)}{3(x - 5)} \times \frac{ ({x } - 5)(x + 5)}{3(x + 3)} = \\ = \frac{5}{3 \times 3} (x + 5) = \\ = \frac{5}{9} (x + 5) = \frac{5}{9} x + \frac{25}{9} = \\ = \frac{5}{9} x + 2\frac{7}{9}$