\(6\cdot7\cdot8\cdot9\cdot\frac{1}{18\cdot16\cdot14\cdot12\cdot2}\)
\(=\frac{6\cdot7\cdot8\cdot9}{3\cdot6\cdot4\cdot4\cdot7\cdot2\cdot2\cdot3\cdot2\cdot2}\)
\(=\frac{6\cdot7\cdot8\cdot9}{6\cdot7\cdot8\cdot9\cdot3\cdot4\cdot2\cdot2}\)
\(=\frac{1}{48}\)
\(\frac{2.3.7.2.2.2.3.3.1}{2.3.3.2.2.2.2.2.7.2.2.3.2}=\frac{1}{32}\)
học tốt
1.\(=\frac{7.2.2.2.2.3.3.3.1}{2.2.2.2.2.2.2.2.2.3.3.3.7}=\frac{1}{32}\)
2.\(=\frac{6.7.8.9.1}{3.3.3.7.2.2.2.2.2.2.2.2.2}=\frac{6.7.8.9.1}{\left(3.3\right).\left(2.2.2\right).7.\left(2.3\right).\left(2.2.2\right).\left(2.2\right)}=\frac{6.7.8.9.1}{9.8.7.6.8.4}=\frac{1}{32}\)
