Điền số thích hợp vào chỗ chấm. a) 3 /4 + 8/ 5 = . . . . . . . . . . . .
Giải thích
a) \(\frac{3}{4} + \frac{8}{5} = \frac{{47}}{{20}}\)
b) \(\frac{2}{9} + \frac{5}{2} = \frac{{49}}{{18}}\)
c) \(\frac{5}{8} + \frac{2}{7} = \frac{{51}}{{56}}\)
d) \(\frac{2}{3} + \frac{1}{8} = \frac{{19}}{{24}}\)
e) \(\frac{3}{2} - \frac{6}{7} = \frac{9}{{14}}\)
f) \(\frac{7}{5} - \frac{1}{6} = \frac{{37}}{{30}}\)
g) \(\frac{8}{9} - \frac{2}{7} = \frac{{38}}{{63}}\)
h) \(\frac{9}{4} - \frac{5}{9} = \frac{{61}}{{36}}\)