Tính -2 1/5.(-9/11).(-1 1/14).2/5

* Hướng dẫn giải

$\left(-2\frac{1}{5}\right).\left(-\frac{9}{11}\right).\left(-1\frac{1}{14}\right).\frac{2}{5}=\left(-\frac{11}{5}\right).\left(-\frac{9}{11}\right).\left(-\frac{15}{14}\right).\frac{2}{5}=-\frac{27}{35}$