Rút gọn rồi tính. a) 9/15 - 1/15
25/30
Rút gọn rồi tính.
a) \(\frac{9}{{15}} - \frac{1}{5}\)
c) \(\frac{6}{7} - \frac{{12}}{{21}}\)
| b) \(\frac{8}{{18}} - \frac{{16}}{{36}}\)
d) \(\frac{{32}}{{40}} - \frac{6}{{10}}\)
|
Giải thích
a) \(\frac{9}{{15}} - \frac{1}{5} = \) \(\frac{3}{5} - \frac{1}{5} = \frac{2}{5}\) c) \(\frac{6}{7} - \frac{{12}}{{21}} = \) \(\frac{6}{7} - \frac{4}{7} = \frac{2}{7}\) | b) \(\frac{8}{{18}} - \frac{{16}}{{36}} = \) \(\frac{4}{9} - \frac{4}{9} = 0\) d) \(\frac{{32}}{{40}} - \frac{6}{{10}} = \) \(\frac{4}{5} - \frac{3}{5} = \frac{1}{5}\) |