Tính nhanh: 1/10 * /23 * 3/4 * 4/5 * 5/6 * 6/5 * 5/4 * 4/3 * 3/2

* Hướng dẫn giải

$\frac{1}{10}\times \frac{2}{3}\times \frac{3}{4}\times \frac{4}{5}\times \frac{5}{6}\times \frac{6}{5}\times \frac{5}{4}\times \frac{4}{3}\times \frac{3}{2}=\frac{1\times 1\times 1\times 1\times 1\times 1\times 1\times 1\times 1}{10\times 1\times 1\times 1\times 1\times 1\times 1\times 1\times 1}=\frac{1}{10}$