Nối phép tính với kết quả đúng:

Giải thích

\[\frac{4}{3} + \frac{5}{7} = \frac{{28}}{{21}} + \frac{{15}}{{21}} = \frac{{43}}{{21}}\]

\[\frac{7}{5} - \frac{1}{9} = \frac{{63}}{{45}} - \frac{5}{{45}} = \frac{{58}}{{45}}\]

\[\frac{4}{5} + \frac{5}{9} = \frac{{36}}{{45}} + \frac{{25}}{{45}} = \frac{{61}}{{45}}\]

\[\frac{{11}}{3} - \frac{9}{7} = \frac{{77}}{{21}} - \frac{{27}}{{21}} = \frac{{50}}{{21}}\]