A.\(\dfrac{{a\sqrt {35} }}{7}\)
B.\(\dfrac{{2a\sqrt {35} }}{7}\) 
C.\(\dfrac{{3a\sqrt {35} }}{7}\) 
D.\(\dfrac{{a\sqrt {35} }}{{14}}\)

A.\(65021\)
B.\(65024\) 
C.\(65022\) 
D.\(65023\)

A.\(124\) 
B.\(132\)  
C.\(136\)  
D.\(120\)

A.\(\dfrac{{{a^3}\sqrt {10} }}{2}\)
B.\(\dfrac{{{a^3}\sqrt {10} }}{6}\) 
C.\({a^3}\sqrt 5 \) 
D.\(\dfrac{{{a^3}\sqrt 5 }}{3}\)

A.12
B.15
C.9
D.6

A.\(P = \sqrt {13}  + \sqrt {73} \)
B.\(P = \dfrac{{5\sqrt 2  + 2\sqrt {73} }}{2}\)
C.\(P = 5\sqrt 2  + \sqrt {73} \)
D.\(P = \dfrac{{5\sqrt 2  + \sqrt {73} }}{2}\)

A.\(h = R\sqrt 3 \)  
B.\(h = R\sqrt 2 \) 
C.\(h = \dfrac{{4R}}{2}\)   
D.\(h = \dfrac{{3R}}{2}\)

A.\(\dfrac{1}{{32}}\)   
B.\(\dfrac{1}{{16}}\)  
C.\(\dfrac{1}{8}\)    
D.\(\dfrac{1}{4}\)

A.\(A = B = C\).
B.\(A < B < C\).
C.\(A > B > C\).
D.\(A < C < B\).

A.\(\frac{{a + 2}}{{a + 1}} > \frac{{a + 3}}{{a + 2}}\)
B.\(\frac{{a + 2}}{{a + 1}} < \frac{{a + 3}}{{a + 2}}\)
C.\(\frac{{a + 2}}{{a + 1}} = \frac{{a + 3}}{{a + 2}}\)
D.Tất cả đều sai