Kết quả phép tính

Đáp án đúng là: D

\(\left( {\frac{3}{4}\,\, + \,\,\frac{2}{5}} \right)\,\, + \,\,\frac{7}{5}\) = \(\left( {\frac{{15}}{{20}}\,\, + \,\,\frac{8}{{20}}} \right)\,\, + \,\,\frac{{28}}{{20}}\) = \(\frac{{23}}{{20}}\,\, + \,\,\frac{{28}}{{20}}\,\, = \,\,\frac{{51}}{{20}}\,\,\)