Question

giải mik câu này với

 

 

Answer 1

\(E=\dfrac{5\cdot2^{30}\cdot3^{18}-3^{20}\cdot2^2\cdot2^{29}}{5\cdot2^{29}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{2^{30}\cdot3^{18}\left(5-3^2\cdot2\right)}{2^{29}\cdot3^{18}\left(5\cdot3-7\right)}=\dfrac{2\cdot\left(-13\right)}{8}=-\dfrac{13}{4}\)