Question

Сократите дробь ab-3b-2a+6 15-5a

Answer 1

$\frac{ab-3b-2a+6}{15-5a}= \frac{a*b-3*b-2*a+2*3}{(-5)*(-3)+(-5)*(a)}= \frac{b*(a-3)-2*(a+3)}{(-5)*[(-3)+(a)]}=$
$= \frac{(b-2)*(a-3)}{-5*(a-3)}= \frac{b-2}{-5} =-\frac{b-2}{5} =\frac{-(b-2)}{5}=\frac{2-b}{5}$