Question

Ở OLM ko ai trl nên qua đây hỏi 

Answer 1

\(=\dfrac{5\cdot3^{18}\cdot2^{30}-3^{20}\cdot2^{29}}{5\cdot2^{29}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{3^{18}\cdot2^{29}\left(5\cdot2-3^2\right)}{2^{29}\cdot3^{18}\left(5\cdot3-7\right)}=\dfrac{10-9}{15-7}=\dfrac{1}{8}\)