Question 638538
A) 6, 12, 30

{{{gcf(2*3,2*2*3,2*3*5) = 2*3=6}}}
{{{lcm(2*3,2*2*3,2*3*5)=lcm(2*2*3,2*3*5)=2*2*3*5=60}}}

B) 
{{{gcd(9x^2,5xy,3xy^2)=gcd(x,3xy^2)=x}}}
{{{lcd(9x^2,5xy,3xy^2)=lcd(9*5x^2*y,3xy^2)=45x^2*y^2}}}