Question

A=\(\dfrac{5x4^{15}x9^9-4x3^{20}x8^9}{5x2^{29}x9^{16}-7x2^{29}27^6}\)

Answer 1

\(A=\dfrac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^{29}\cdot9^{16}-7\cdot2^{29}\cdot27^6}\)

\(=\dfrac{5\cdot2^{30}\cdot3^{18}-3^{20}\cdot2^{27}\cdot2^2}{5\cdot2^{29}\cdot3^{32}-7\cdot2^{29}\cdot3^{18}}\)

\(=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-3^2\right)}{2^{29}\cdot3^{18}\left(5\cdot3^{14}-7\right)}=\dfrac{1}{5\cdot3^{14}-7}\)

Answer 2

Lưu ý : Dấu x ở trên là dấu nhân nhé!