Điền vào chỗ chấm. a) 3/5 + 1/15 = ..../...+ ..../... =..../... = ..../...
Giải thích
Điền vào chỗ chấm.
a) \[\frac{3}{5} + \frac{1}{{15}} = \frac{9}{{15}} + \frac{1}{{15}} = \frac{{10}}{{15}} = \frac{2}{3}\] | b) \[\frac{{18}}{{21}} + \frac{3}{7} = \frac{{18}}{{21}} + \frac{9}{{21}} = \frac{{27}}{{21}} = \frac{9}{7}\] |
c) \[\frac{5}{8} + \frac{5}{{24}} = \frac{{15}}{{24}} + \frac{5}{{24}} = \frac{{20}}{{24}} = \frac{5}{6}\] | d) \[\frac{3}{8} + \frac{{25}}{{40}} = \frac{{15}}{{40}} + \frac{{25}}{{40}} = \frac{{40}}{{40}} = 1\] |