Tính
Giải thích
Hướng dẫn giải
a) \[\frac{1}{7} + \frac{1}{{14}} = \frac{2}{{14}} + \frac{1}{{14}} = \frac{3}{{14}}\] | b) \[\frac{9}{{11}} - \frac{3}{{22}} = \frac{{18}}{{22}} - \frac{3}{{22}} = \frac{{15}}{{22}}\] |
Hướng dẫn giải
a) \[\frac{1}{7} + \frac{1}{{14}} = \frac{2}{{14}} + \frac{1}{{14}} = \frac{3}{{14}}\] | b) \[\frac{9}{{11}} - \frac{3}{{22}} = \frac{{18}}{{22}} - \frac{3}{{22}} = \frac{{15}}{{22}}\] |