x/6ab^3 ---> 3ac/18a^2b^3c
y/9a^2bc ---> 2b^2/18a^2b^3c原分子的x和y还有吗？哦，我漏写上了该是x/6ab^3 --->3acx/18a^2b^3cy/9a^2bc---> 2b^2y/18a^2b^3c