Question

Сократите дробь: 10x-x²-25 / 3x-15
A) x+5 B) 5-x / 3
C) x+5 / 3 D) x-5

Answer 1

$\frac{10 \times - \times {}^{2} - 25}{3 \times - 15}$
$\frac{ - 1( \times {}^{2} - 10 \times + 25)}{3 \times - 15}$
$\frac{ - 1( \times - 5) {}^{2} }{3( \times - 5)}$
$\frac{ - \times + 5}{3} = \frac{5 - \times }{3}$
Ответ: В