5x^2/y * 7y^3/2x^3 ; 5a-5/a^2 * 3a^3/a-4 ; p^2/3q * 4q/2p ; (a/2b)^3;

5x^2/y * 7y^3/2x^3=35y^2\2x ; 5a-5/a^2 * 3a^3/a-4=(15a^2-15)\(a-4) ; p^2/3q * 4q/2p=2p\3; (a/2b)^3=a^3\8b^3