Điền dấu thích hợp vào chỗ chấm: \(\dfrac{{ - 5}}{{13}} \cdot  \cdot  \cdot \dfrac{{ - 7}}{{13}}\)  

\({\left( {\dfrac{{ - 7}}{6}} \right)^2} = \dfrac{{ - 49}}{{36}}\) 

\({\left( {\dfrac{2}{3}} \right)^3} = \dfrac{8}{9}\)  

\({\left( {\dfrac{2}{{ - 3}}} \right)^3} = \dfrac{8}{{ - 27}}\)          

\({\left( {\dfrac{{ - 2}}{3}} \right)^4} = \dfrac{{ - 16}}{{81}}\)

$\dfrac{5}{8}$                         

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

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

$ - 5,8$

\(2,5\)

\(5,2\)

\(0,4\)

\(0,04\)

$180$ 

\(500\)  

\(750\) 

\(450\)

$\dfrac{a}{m} + \dfrac{b}{m} = \dfrac{{a - b}}{m}$ 

$\dfrac{a}{m} + \dfrac{b}{m} = \dfrac{{a.b}}{m}$  

$\dfrac{a}{m} + \dfrac{b}{m} = \dfrac{{a + b}}{m}$        

$\dfrac{a}{m} + \dfrac{b}{m} = \dfrac{{a + b}}{{m + m}}$

\(4\)

\(1\)  

\(3\)

\(2\)