A.\(d = \dfrac{{\sqrt 3 a}}{2}\)
B.\(d = a\)
C.\(d = \dfrac{{\sqrt 5 a}}{5}\)
D.\(d = \dfrac{{\sqrt 2 a}}{2}\)

A.\(h(4) = h( - 2) > h(2)\)
B.\(h(4) = h( - 2) < h(2)\)
C.\(h(2) > h(4) > h( - 2)\)
D.\(h(2) > h( - 2) > h(4)\)

A.\(m \in ( - \infty ;0) \cup {\rm{[}}4; + \infty )\)
B.\(m \in \mathbb{R}\)
C.\(m \in \left( { - \dfrac{5}{4}; + \infty } \right)\) 
D.\(m \in ( - 2; + \infty )\)

A.\({P_{\min }} = \dfrac{{9\sqrt {11}  - 19}}{9}\) 
B.\({P_{\min }} = \dfrac{{9\sqrt {11}  + 19}}{9}\)
C.\({P_{\min }} = \dfrac{{18\sqrt {11}  - 29}}{9}\) 
D.\({P_{\min }} = \dfrac{{2\sqrt {11}  - 3}}{3}\)

A.\(0\)
B.Vô số
C.\(1\)
D.\(2\)

A.\(T =  - 2\)
B.\(T = 1\)
C.\(T =  - 1\)
D.\(T = 0\)

A.\(V = \dfrac{{7\sqrt 2 {a^3}}}{{216}}\)
B.\(V = \dfrac{{11\sqrt 2 {a^3}}}{{216}}\)
C.\(V = \dfrac{{13\sqrt 2 {a^3}}}{{216}}\)
D.\(V = \dfrac{{\sqrt 2 {a^3}}}{{18}}\)

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

A.\(P = \dfrac{7}{{12}}\)
B.\(P = \dfrac{1}{{12}}\)
C.\(P = 12\)
D.\(P = \dfrac{{12}}{7}\)

A.\(s = 23,25{\rm{ (km)}}\)
B.\(s = 21,58{\rm{ (km)}}\)
C.\(s = 15,50{\rm{ (km)}}\)
D.\(s = 13,83{\rm{ (km)}}\)