Tính: \(3 + \dfrac{4}{9} \times \dfrac{7}{{25}} \times \dfrac{{27}}{{12}} \times {\rm{ 3}}\dfrac{{\rm{4}}}{{\rm{7}}} - \dfrac{7}{{25}}\)

* Hướng dẫn giải

Ta có:

\(\begin{array}{l}3 + \dfrac{4}{9}\times \dfrac{7}{{25}}\times \dfrac{{27}}{{12}}\times {\rm{ 3}}\dfrac{{\rm{4}}}{{\rm{7}}} - \dfrac{7}{{25}}\\ = 3 + \dfrac{4}{9}\times \dfrac{7}{{25}}\times \dfrac{9}{4}\times {\rm{ }}\dfrac{{{\rm{25}}}}{{\rm{7}}} - \dfrac{7}{{25}}\\ = 3 + 1 - \dfrac{7}{{25}}\\ = 4 - \dfrac{7}{{25}}\\ = \dfrac{{93}}{{25}}\end{array}\)