Điền vào chỗ chấm. 7/11 - 3/11 =

a) \[\frac{7}{{11}} - \frac{3}{{11}} = \frac{4}{{11}}\]

b) \[\frac{7}{{12}} - \frac{5}{{12}} = \frac{2}{{12}}\]

c) \[\frac{{13}}{{15}} - \frac{6}{{15}} = \frac{7}{{15}}\]

d) \[\frac{{19}}{{20}} - \frac{9}{{20}} = \frac{{10}}{{20}}\]