Tính các biểu thức sau: 12/4 + 5/2 =

Hướng dẫn: 

a) \(\frac{{12}}{4} + \frac{5}{2} = \frac{{12}}{4} + \frac{{10}}{4} = \frac{{22}}{4} = \frac{{11}}{2}\)

b) \(\frac{6}{9} - \frac{1}{3} = \frac{6}{9} - \frac{3}{9} = \frac{3}{9} = \frac{1}{3}\)

c) \(\frac{9}{{18}} \times \frac{4}{2} = \frac{1}{2} \times 2 = \frac{2}{2} = 1\)

d) \(\frac{5}{9}:\frac{9}{5} = \frac{5}{9} \times \frac{5}{9} = \frac{{25}}{{81}}\)