原题==[-(2/3)a²bc^3][-(3/唤拦4)c^5]²(1/和晌胡3)(ab²c^3)/[(4/9)abc²]=-(2/3)(9/谨塌16)(1/3)(9/4)(a^2bc^3)(c^10)(ab^2c^3)(abc^2)=-(9/32)a^4b^4c^18