b) 4 3/5 + 2/5 . -23/16 - 14/35 : -16/7

* Hướng dẫn giải

b) $4\frac{3}{5}+\frac{2}{5}.\frac{-23}{16}-\frac{14}{35}:\frac{-16}{7}$

$$\begin{gathered} =\frac{5.4+3}{5}+\frac{-23}{5.8}+\frac{14}{35}.\frac{7}{16} \\ =\frac{23}{5}+\frac{-23}{5.8}+\frac{2.7}{5.7}.\frac{7}{2.8} \\ =\frac{23}{5}+\frac{-23}{5.8}+\frac{7}{5.8} \\ =\frac{23}{5}+\frac{-23+7}{5.8} \\ =\frac{23}{5}+\frac{-16}{5.8} \\ =\frac{23}{5}+\frac{-2}{5} \\ =\frac{21}{5} \end{gathered}$$