A.\(\left( {3,1;3,3} \right)\)
B.\(\left( {3,3;3,5} \right)\)
C.\(\left( {3,8;3,9} \right)\)
D.\(\left( {3,5;3,8} \right)\)

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

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

A.\(2\)
B.\(3\)
C.\(15\)
D.\(4\)

A.\(7\)
B.\(8\)
C.\(10\)
D.\(9\)

A.\(S = \left[ {3; + \infty } \right)\)
B.\(S = \left( {\dfrac{3}{4}; + \infty } \right)\)
C.\(S = \left[ { - \dfrac{3}{8};3} \right)\)
D.\(S = \left( {\dfrac{3}{4};3} \right]\)

A.\(f\left( 1 \right) =  - e\)
B.\(f\left( 1 \right) =  - \dfrac{2}{e}\)
C.\(f\left( 1 \right) = \dfrac{1}{e}\)
D.\(f\left( 1 \right) = \dfrac{2}{e}\)

A.Đường tròn tâm \(I\left( {0;1} \right)\), bán kính \(R = \sqrt 2 \).
B.Đường tròn tâm \(I\left( {1;0} \right)\), bán kính \(R = \sqrt 2 \).
C.Đường tròn tâm \(I\left( { - 1;0} \right)\), bán kính \(R = \sqrt 2 \).
D.Đường tròn tâm \(I\left( {0; - 1} \right)\), bán kính \(R = \sqrt 2 \).

A.\(\dfrac{1}{{1287}}\)
B.\(\dfrac{4}{{6435}}\)
C.\(\dfrac{4}{{6453}}\)
D.\(\dfrac{1}{{1278}}\)

A.\(9\)
B.\(13\)
C.\(15\)
D.\(11\)