Question

(ab)^10:(a^9*b^8)*a^2​

Answer 1

$(ab)^{10}:(a^9*b^8)*a^2=a^{10}b^{10}:a^{11}b^8=a^{10-11}b^{10-8}=a^{-1}b^2=\frac{b^2}{a}$