c) 5/11. 18/29 - 5/11 . 8/29 + 5/11 . 19/29

* Hướng dẫn giải

$\begin{array}{l}\mathrm{c}) \frac{5}{11}.\frac{18}{29}-\frac{5}{11}.\frac{8}{29}+\frac{5}{11}.\frac{19}{29}\\ =\frac{5}{11}\left(\frac{18}{29}-\frac{8}{29}+\frac{19}{29}\right)\\ =\frac{5}{11}\left(\frac{18-8+19}{29}\right)\\ =\frac{5}{11}.\frac{29}{29}\\ =\frac{5}{11}.1\\ =\frac{5}{11}.\end{array}$