Question

若ab^2=-6,则-ab(a^2b^5-ab^3-b)=?

Answer 1

-ab(a^2b^5-ab^3-b)=-ab(a^2b^5-ab^3-b)=-a^3b^6+a^2b^4+ab^2=-(ab^2)^3+(ab^2)^2+(ab^2)=-(-6)^3+(-6)^2(-6)=216-36-6=174