\(C=\frac{5\cdot4^{15}\cdot9^9-4\cdot3^{20}\cdot8^9}{5\cdot2^9\cdot6^{19}-7\cdot2^{29}\cdot27^6}=\frac{5.2^{30}\cdot3^{27}-2^{29}\cdot3^{20}}{5\cdot2^{38}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}=\frac{\left(5\cdot2\cdot3^7-1\right)\left(2^{29}\cdot3^{20}\right)}{\left(5\cdot2^9\cdot3-7\right)\left(2^{29}\cdot3^{18}\right)}\)
Ra kết quả hơi to nên không tính. Bạn tính hộ mình nhé OK!!!