18v^{7}u^{6} can be factored as 3^{2} x 2 x v^{7} x u^{6}
27v^{2}x^{8}u^{5} can be factored as 3^{3} x v^{2} x x^{8 } x u^{5}
Rmember that when you divide exponents you subtract one from the other.
Now we can see what they have in common: 3^{2}, v^{2}, and u^{5}.
The greatest common factor is 9v^{2}u^{5}.
11/11/2013

Nancy K.