Rút gọn rồi quy đồng mẫu số các phân số \(\dfrac{{3\;.\;4 - 3\;.\;7}}{{6.5 + 9}}\)  và \(\dfrac{{6\;.\;9 - 2\;.\;17}}{{63\;.\;3 - 119}}\) ta được

\(\dfrac{{ - 1}}{7}\) 

\(\dfrac{{ - 1}}{{14}}\)  

\(\dfrac{4}{{ - 56}}\)         

\(\dfrac{{ - 1}}{{70}}\)    

\(\dfrac{a}{0}\)

\(\dfrac{0}{a}\)

\(\dfrac{a}{1}\)

\(\dfrac{1}{a}\)

$\dfrac{5}{8}$                         

$\dfrac{8}{{ - 5}}$                            

$\dfrac{{ - 5}}{8}$                          

$ - 5,8$

$\dfrac{1}{3}$                     

\(\dfrac{4}{3}\)  

\(\dfrac{3}{4}\)                 

\(1\)

$\dfrac{{1123}}{{1125}} > 1$           

\(\dfrac{{ - 154}}{{ - 156}} < 1\)               

\(\dfrac{{ - 123}}{{345}} > 0\)           

\(\dfrac{{ - 657}}{{ - 324}} < 0\)

$8$ 

\(\dfrac{9}{5}\)  

\(\dfrac{3}{5}\)          

\(2\)