Kết quả của ​\(\begin{aligned} B &=\left(\frac{4}{3}+\frac{8}{3}\right) \cdot\left(\frac{7}{4}-\frac{6}{4}\right):\left(\frac{6}{5}+\frac{12}{5}+\frac{1}{5}\right) \end{aligned}\)...

* Hướng dẫn giải

Ta có:

 \(\begin{aligned} B &=\left(\frac{4}{3}+\frac{8}{3}\right) \cdot\left(\frac{7}{4}-\frac{6}{4}\right):\left(\frac{6}{5}+\frac{12}{5}+\frac{1}{5}\right) \\ &=\frac{12}{3} \cdot \frac{1}{4}: \frac{19}{5} \\ &=1: \frac{19}{5} \\ &=\frac{5}{19} . \end{aligned}\)