Số các cặp số nguyên $\left( {x;y} \right)$ thỏa mãn $\dfrac{1}{{18}} < \dfrac{x}{{12}} < \dfrac{y}{9} < \dfrac{1}{4}$ là:

$>$  

$<$  

$=$  

Tất cả các đáp án trên đều sai

$180$ 

$500$  

$750$ 

$450$

${3^3}{.7^2}$                     

${3^3}{.7^3}.11.19$             

${3^2}{.7^2}.11.19$

${3^3}{.7^2}.11.19$

$\dfrac{2}{{ - 3}} > \,\,\dfrac{{ - 7}}{8}$     

$\dfrac{{ - 22}}{{33}} = \dfrac{{200}}{{ - 300}}$

$- \dfrac{2}{5} < \dfrac{{196}}{{294}}$

$\dfrac{{ - 3}}{5} < \,\,\dfrac{{39}}{{ - 65}}$

$\dfrac{{ - 156}}{{149}};\dfrac{{ - 3}}{4};\dfrac{1}{{12}}$ 

$\dfrac{1}{{12}};\dfrac{{ - 156}}{{149}};\dfrac{{ - 3}}{4}$

$\dfrac{{ - 3}}{4};\dfrac{{ - 156}}{{149}};\dfrac{1}{{12}}$

$\dfrac{1}{{12}};\dfrac{{ - 3}}{4};\dfrac{{ - 156}}{{149}}$

$\dfrac{{ - 21}}{{91}},\dfrac{{26}}{{91}}$ 

$\dfrac{{ - 3}}{{13}},\dfrac{2}{7}$  

$\dfrac{{21}}{{91}},\dfrac{{26}}{{91}}$

$\dfrac{{ - 21}}{{91}},\dfrac{{36}}{{91}}$

$\dfrac{{ - 1}}{7}$ 

$\dfrac{{ - 1}}{{14}}$  

$\dfrac{4}{{ - 56}}$         

$\dfrac{{ - 1}}{{70}}$