A. \[\frac{{73}}{{84}}\]
B. \[\frac{{ - 13}}{{84}}\]
C. \[\frac{{83}}{{84}}\]
D. \[\frac{{143}}{{84}}\]
Ta có:
\[\frac{9}{7} - \frac{5}{{12}} = \frac{9}{7} + (\frac{{ - 5}}{{12}}) = \frac{{108}}{{84}} + (\frac{{ - 35}}{{84}}) = \frac{{108 + ( - 35)}}{{84}} = \frac{{73}}{{84}}\]
Đáp án cần chọn là: A