化简求值:(3/4a^4b^7+1/18a^3b^8-1/9a^2b^6)÷(-1/3ab^3)^2,其中a=1/2,b=-4

问题描述:

化简求值:(3/4a^4b^7+1/18a^3b^8-1/9a^2b^6)÷(-1/3ab^3)^2,其中a=1/2,b=-4

(3/4a^4b^7+1/18a^3b^8-1/9a^2b^6)÷(-1/3ab^3)^2=(3/4a^4b^7+1/18a^3b^8-1/9a^2b^6)÷(-1/9a^2b^6)=3/4a^4b^7÷(-1/9a^2b^6)+1/18a^3b^8÷(-1/9a^2b^6)-1/9a^2b^6÷(-1/9a^2b^6)=-27/4a^2b-1/2ab^2+1 =27/4-4...