Question

сократите дробь (21a^3-6a^2b)/(12ab-42a^2)

Answer 1

$frac{21a^3-6a^2b}{12ab-42a^2}=frac{3a^2(7a-2b)}{6a(2b-7a)}=-frac{a}{2}=-0,5a$                

Answer 2

3а(7а^2-2ав)/3а(4в-14а)=7а^2-2ав/4в-14а=а(7а-2в)/2(2в-7а)=а(7а-2в)/-2(7а-2в)=

=-а/2