Question

сократите дробь ab-3b-2a+6
15-5a

Answer 1

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