A.\(\dfrac{{4\sqrt 3 }}{3}\)
B.\(\dfrac{{\sqrt 3 }}{3}\)
C.\(\dfrac{{2\sqrt 3 }}{3}\)
D.\(\dfrac{1}{3}\)

A.\(0\)
B.\(1\)
C.\(2\)
D.\(3\)

A.\(P = \dfrac{{5 + \sqrt 7 }}{4}\) hoặc \(P = \dfrac{{5 - \sqrt 7 }}{4}\)
B.\(P = \dfrac{{2 + \sqrt 3 }}{5}\) hoặc \(P = \dfrac{{2 - \sqrt 3 }}{5}\)
C.\(P = \dfrac{{5 + \sqrt 5 }}{7}\) hoặc \(P = \dfrac{{5 - \sqrt 5 }}{7}\)
D.\(P = \dfrac{{3 + \sqrt 2 }}{5}\) hoặc \(P = \dfrac{{3 - \sqrt 2 }}{5}\)

A.\(0\)
B.\(1\)
C.\(2\)
D.\(\dfrac{1}{2}\)

A.\(\dfrac{1}{4}\)
B.\(\dfrac{1}{{2\sqrt 2 }}\)
C.\(\dfrac{{\sqrt 2 }}{2}\)
D.\(\dfrac{{\sqrt 2 }}{3}\)

A.\(\dfrac{{12 + 2\sqrt 3 }}{{2 + \sqrt 3 }}\)
B.\(\dfrac{{12 - 2\sqrt 3 }}{{2 - \sqrt 3 }}\)
C.\(\dfrac{{12 - 2\sqrt 3 }}{{2 + \sqrt 3 }}\)
D.\(\dfrac{{12 + 2\sqrt 3 }}{{2 - \sqrt 3 }}\)

A.\(T = 1\)
B.\(T = 2\)
C.\(T = 112\)
D.\(T = 130\)

A.\(\dfrac{{ - 2\sqrt 2 }}{3}\)
B.\( - 2\sqrt 2 \)
C.\(\dfrac{{ - 1}}{{2\sqrt 2 }}\)
D.\( - \sqrt 2 \)

A.\( - \dfrac{{31}}{{15}}\)
B.\(\dfrac{{49}}{{15}}\)
C.\( - \dfrac{{49}}{{15}}\)
D.\(\dfrac{{31}}{{15}}\)

A.\(\dfrac{4}{9}\)
B.\( - \dfrac{4}{9}\)
C.\(\dfrac{2}{9}\)
D.\( - \dfrac{2}{9}\)