Tính \(\dfrac{4}{{15}} - \dfrac{2}{{65}} - \dfrac{4}{{39}}\) ta được

\(\dfrac{{ - 2}}{4}\) 

\(\dfrac{{ - 15}}{{ - 96}}\)  

\(\dfrac{{13}}{{27}}\)

\(\dfrac{{ - 29}}{{58}}\)

$ - \dfrac{1}{4}$        

\(\dfrac{3}{2}\)  

\(\dfrac{1}{4}\)                 

\(\dfrac{3}{4}\)

\(\dfrac{6}{7} < \dfrac{8}{7} < \dfrac{7}{7}\)

\(\dfrac{9}{{22}} < \dfrac{{13}}{{22}} < \dfrac{{18}}{{22}}\)

\(\dfrac{7}{{15}} < \dfrac{8}{{15}} < \dfrac{4}{{15}}\)

\(\dfrac{5}{{11}} > \dfrac{7}{{11}} > \dfrac{4}{{11}}\)

$PN + MN = PN$               

$MP + MN = PN$    

$MP + PN = MN$     

$MP - PN = MN$

Song song

Trùng nhau

Cắt nhau

Cả ba đáp án trên đều đúng

$390kg$     

$120kg$         

$270kg$

\(385\,kg\)

\(\widehat {MON}\)              

\(\widehat {MON};\widehat {NOP};\,\widehat {MOP}\)                             

\(\widehat {MON};\widehat {NOP}\)      

\(\widehat {NOP};\,\widehat {MOP}\)