Question

Сократите дробь:
$frac{12-5-2x^2}{15-10x}$

Answer 1

$displaystyle tt frac{12-5-2x^2}{15-10x}=frac{-2x^2-5x+12}{-10x+15}=frac{-2x^2+3x-8x+12}{-5(2x-3)}=\\\ displaystyle tt =frac{-x(2x-3)-4(2x-3)}{-5(2x-3)}=frac{-(2x-3)(x+4)}{-5(2x-3)}=frac{-(x+4)}{-5}=\\\ displaystyle tt =bold{frac{x+4}{5}}$