Thực hiện phép tính sau: - \left( +

* Hướng dẫn giải

\(\begin{array}{l}b)\,7\dfrac{5}{{11}} - \left( {2\dfrac{3}{7} + 3\dfrac{5}{{11}}} \right)\\ = 7 + \dfrac{5}{{11}} - \left( {2 + \dfrac{3}{7} + 3 + \dfrac{5}{{11}}} \right)\\ = 7 + \dfrac{5}{{11}} - 2 - 3 - \dfrac{3}{7} - \dfrac{5}{{11}}\\ = \left( {7 - 2 - 3} \right) + \left( {\dfrac{5}{{11}} - \dfrac{5}{{11}}} \right) - \dfrac{3}{7}\\ = 2 + 0 - \dfrac{3}{7}\\ = \dfrac{{14}}{7} - \dfrac{3}{7}\\\, = \dfrac{{11}}{7}\end{array}\)